After defining System item flexfield next step to do is to define Item categories flexfield .
1. Go to Inventory responsibility and open Key Fleffield 
    Flexfield -> Key -> Segments

Key Flex Field

In flexfield title search for Item Categories.

Item Categories

2. Enter new record in this case ORK Item Categories. Now click on segments to enter segments summary.

3. You can define any number of segments according to your business requirement  here is this example we   will define three segments.

4. Enter first segment as Super Category. assign column and value set to this segment.
5. Repeatedly do above step for both next segments.Column indicates the database fields that will hold entered value for specific segment. Now enter your desired item segments name and their corresponding value sets.
6. Now freeze flexfield and compile it.
Optional step before defining inventory organization
Define Location.
1. Now In Inventory responsibility navigate to
    Setup -> Organizations -> Organizations

Enter organization name and type from pre defined list.
In this case this organization is defined as Master Org.
2. To define a location navigate to
     Setup -> Organizations -> locations

There are two options for scope Global and Local
Global: If global selected then this location will be available for all modules.
After entering name and description move to address details tab.

3. Choose your address style as address styles are defined according to your country.
    Enter remaining details and save you work. 

4. Now select location ORK Locations in organization definition form.

    Save your work as it is required before proceeding to next step.
    In classification tab select inventory organization from list of values and check it.

5. Now click on others to add additional organizational information.

This API provide functionality to assign one/more items to an organization(s)
How to Assign Item Using Assign_item_to_org 

2. Item Creation and Updation Public API.
This API used to create items.

 3. Category Code Creation Public API.
This API provides functionality to create a category.

4. Item Category Assignment Public API

5. Item Catalog Descriptive Element Public API.


6. Item Revision Creation and Updation Public API.

7. Implement Item Pending Changes Public API.

This API provides functionality to implement pending changes (phase and/or status) for an item/item revision.

8. Item Lifecycle Public API.

9. Item Grant public API

10. Item User-Defined Attributes Data Public API.

11. Item Assignment to an Organization Public API.
1.    First define value set for item flexfield segments.
Go to inventory responsibility and navigate to value set.
Setup -> Flexfield->Validation->Sets
2.       Define Value Set for Item Section.
Choices: List Type, Enter format validation of your own choice, validation type.

3.       Define Value Set for Sub Section.
Sub Section Value Set is dependent on item section.
To configure select dependent validation type and click on Edit Information.
4.       Define Value Set For Serial No.
Serial No is also dependent on item section.
5.       Now value set for Condition Code and future segment.
Ok we are done with first part of creating value set. Now for second step .

6.       Navigate to Key Flexfield Segments Definition Form.
         Setup -> Flexfield->Key->Segments
7.       Now search with flexfield title “System Items”.
8.       Click on Segments and navigate to  Segment Summary Window.
Now enter your desired item segments name and their corresponding value sets.
Column indicates the database fields that will hold entered value for specific segment.
9.       After entering segments summary navigate back to KFF segments window. Save form and check freeze flex field definition option.
10.       Now compile your KFF.
      It is configured now.
If you want to predict needs of your material or to plan material requirement then you can configure workday calendar for this.
Work day calendar(Oracle Inventory Calendar) provide lot of flexibility in terms of shifts, pattern for working days also you can configure exceptions.
Following are Configuration Steps.
1.       Go to work day calendar.

On Workday Calendar Window.

You can choose weekly calendar, monthly or periodic calendar type.
Like 4/4/5 is two four-week periods followed by one five week period and 5/4/4 is vice versa.
For twelve months in a year use calendar months.
 13 Periods is thirteen for week period’s year wise.
Start date and end date are very important in configuring work day calendar.
As your organization standard on and off days will be calculated on the base of start date along with week day.
i.e.  For standard five day week your start date must fall on Monday.
Ok it’s all done on work day calendar window.
Workday Patterns

Now navigate to Workday pattern window.
Like 5 days on 2 day off or 7 day on 0 day off. Whatever is your requirement?
Configuring Shifts

Multiple no of shifts can be configured for single calendar.

Enter shift start time and end time.
Likewise you can separately define different shifts and their specific time lines.

Now navigate back to Inventory Calendar window and save you work.
Saving your work will generate complete calendar from start date to end date given in calendar window.

Handling Exception
Click on any date and then navigate to exceptions window. Do this by choosing the exception list button.
Here you can define exception related to this date.
Like in following picture we create an exception by declaring and off day as on.

Save your work.