[Help] How to add new statics to editor?

[Ason]

Hey, I want to add the Vadso city/Dragon fly apartment buildings(The ones with metal balcony) to the editor, the only thread I could find explaining how to do it was this one:
https://www.realitymod.com/forum/f189-m ... dding.html

The problem is I'm not an expert so I'm wondering if there is a more detailed thread on this? Or if someone could explain to me in a more detailed way?

"If you add new custom statics or w/e you want in your map, simply put them into your pr_edit mod in the right place, and if you also want to test with them pack them up into the .zips "

where is the right place ? Pack them into which .zips etc?