Need pattern making help: How to copy something that duplicates changes simultaneously?

OHHHHHHHHHHHH! I didn’t realise that! I just tried what you said and it’s working! Thank you so much Dave! I really really appreciate your help!
I need to get used to a 3D platform, it’s usually all 2D on autoCAD, unless you change your workspace.

I’m so sorry for the trouble everyone!
Just one more question, can we change the colour of the lines we draw, while drawing them? Or is it only going to stay black?

You can edit the edge color in the Styles window.