Burn games to DVD and BluRay

[EliasTD5]

I have a problem since 5 days. I want to burn repacks from FitGirl into DVDs and BluRays. I just can burn games like 7,5G, 3,6G or 23G, because they have the perfect size for disks. But I cant burn games like 9G (because I dont want to use a 25G BluRay, instead I want use a 8,5G DVD) and I cant burn 26G games. Now my question:
Is it possible to split FitGirl setups into 2 different? I mean, that the first DVD, after his part of setup, is searching for the next part of setup? I tried it myself (unpacking her setup.exe, etc.), but I cant do this😕
Hopefully someone can help me