Link value in DFF or KFF to the expense combination in audit expense

Dear all,

Kindly note the below :

I created a dff on the create item screen and we have a requirement that the value of this dff be linked to the expense combination in audit expense. Also i tried this with kff, in kff i can only see 2 kff ( 2 segments : company and cost center ) but the segments that i want to use are different. Kindly advise.

Best regards,

Elia