I'm using the Graitec PowerPack Build 617 (22/05/2018) on Advance Steel 2019.

I have used the "Floor Covers from Standard Gratings" command. I have selected the perimeter beams because I can't work out how to select an area. Unfortunately, the grating panels are not square. They are not positioned exactly on the edge of the beam, and lengths are not consistent i.e. they are not square. All panels are different lengths meaning they are treated as separate parts when there should be multiple instances of the same part.

What am I doing wrong? I'm still learning this program, so I'm probably doing many more things wrong... So feel free to let me know. Thanks.