assign valuation variant to costing variant OKKN/OKK4

Dear Team,

I need to create a new costing variant with a new valuation variant. these are the steps I did.

1. OKKN - Create a the costing variant

2. OKK4 - Create the valuation variant

I cant find a T code to assign the valuation variant the new costing variant.

I have looked many Blogs, but couldnt able to find a way of doing it.

Please help.

Br,

PubuduS.