i want to write one java code to create a part using ODATA Rest API (POST Request)how can we create

@SD_10636834 

Do you need to create a WTPart or a CAD Document part?

For the WTPart creation there is a ODATA service 

check your windchill installation documentation

https://serverName/Windchill/netmarkets/html/wrs/doc.html

The service depends on your wch version. In my case it is ODATA V3

Here is an Article that describes simple ODATA function creation

CS357512 - How to create a custom ODATA domain with a simple custom endpoint

all information for Rest API customization is here

CS183488 - Windchill PLM Rest Services - Customization

PetrH