How to burn 2 or more PSX iso into one CD

I have a lot of PSX iso and clone Cd images,but some of them are small e.g revolt only 44mb…I have to waste whole cd for 44mb. :smiley:
I would like to know how to burn 2 or more iso or images into one CD and to be able to play them in modified play station.
I heard that i need boot menu to choose wich game i would like to start
but i don,t know what tools i need to do so.
If somebody can help me i will appreciate that