Hi @theuang_PBH
We're glad you're here. When you get a chance, please introduce yourself on this forum thread. I'd also encourage you to add a real picture as your avatar because it helps build community!
this problem is already solved and as described above you need to wrap the part of your form you may need to skip in a group and use Relevant as described in https://xlsform.org/en/#skipping. If you have any questions please attach your form and we will try to help.