Create a shared category for each project category that you want to link the subcontract category group.

Standard procedure

1.	Go to Project management and accounting > Setup > Categories > Shared categories.
2.	Click New.
3.	In the Category ID field, type a value.
4.	In the Category name field, type a value.
5.	Select Yes in the Can be used in Project field.
6.	Click Save.