Add normal field values to another form's subform

Add normal field values to another form's subform

Hello,

I have two forms. I’d like to add normal fields from FORM A to subform fields in FORM B.

I have product details in normal fields in Form A (Product, Price, Date, Staff in charge). And I'd like to add these records to a subform in Form B.
Can you help me how to do that please?

Thanks in advance