Help ! how to create snap from software all ready install on system

Hi all
I’m trying to set up a Quartus prime lite edition to program fpga chips all though I have succeeded it a real pain when i have to reinstall it’s 64 bit.
also I have install model modelsim which is a part of Quartus but this is 32bit?
Question what is the easiest way to create two snaps to make it easy install

Also have been using linux for 20 years is there a quick walk through to create a snap?