You don't seem new to Archicad (you have been on the forum for nearly 10 years).
You place the plans on the layout just as you would for a single house plan.
Schedules are just for listing the elements that make up your model
Graphic Overrides just affect the way those elements look in the model.
You need to create a 'view' of your floor plan (for each storey) with the correct layer combination, pen set, reno filter, graphic override, etc. all set up so you see the plan exactly as you want it.
These settings are all saved with the view (in the view map).
You then place this view on the layout (you can drag and drop from the view map onto a layout page or you can use the drawing tool and then select the view you want.
If you have all the apartments in one big plan, then you can duplicate the drawing (the view you have just place) and you can crop the frame boundary to show each unit.
You keep repeating for each apartment plan.
You will need a new layout page for each apartment, unless you can fit a few on one page.
It is up to you how you set it out.
One of the forum moderators.
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