SD Gundam G Generation Crossrays Custom Character Fleet Development

Hi there, I’m reading off the guide for creating custom characters for my OC ship fleet and I am confused about how I should go about creating my characters

questions are the following.

Do I only need the last number for example 7month 21day = 28 = 8 being the last number to create the commander and aux?

I kinda want to create a op crew for my inferno run. But I’m confused at what I’m reading SOOooo forum time