Using the pass through on my laser

I have a makerspace G750L GENESIS, it has doors that fold down on both sides of the machine, so you can use larger pieces of material, completing a cut, then moving it along to complete the next cut doing a larger image than the size of the bed. I was hoping one of you knowledgeable people might have had experience doing this and could let me know how to line up the next cut so it starts in the best spot to avoid creating a line were the next cut starts.
Thanks for any help you can offer

Have a look at this. Align Your Projects With Print and Cut