Material determination free of goods

Dear sd gurus

i have one scenario in material determination , generally we are giving free of goods to material ABC . from now on wards we are giving substituenting the material 123

i mean we are giving material 123 instead of ABC

SO when we create order automatically free goods will come as like as ABC Material ? or we can give manual also

i am thinking if want to fulfil shall i maintain free goods in vbn1 also ?

Thank you so much for your help