Thanks guys... this is all really helpful, and much appreciated - thank you.

Thanks Dave and thank you box... lesson learned

Thanks... i've tried that but it's impossible to select all the edges and lines of the wall without selecting the other wall.

The second wall was originally created by pulling out from the other wall.

I have loads of these walls that i now need to separate

Thanks guys.

For example, how can i separate these two walls as separate groups easily without having to re-draw.

Thank you Dave.

How would i go about taking once complete centerpiece out of the long rectangular box.

For example, let's say it is 1200m long X 200m wide X 200m high - how would i take a 400m X 200m X 200m box out of the center of that?

Hello, is it possible to cut part of an object out from another object.

For example, lets say i had a long rectangular box and i wanted to cut (not delete) part of it out as another component or group... is that possible?

Ha, very true, thanks

Ok thank you. There seems to be a lot of different ways to accomplish it, so i'm just trying to find out what the best practice is.

Thank you Dave. Can you clarify what you mean?

Do you think using active cuts is a better method, or should you just apply a section plane to each scene (one flattening the object and another one not)?

Ok great thanks. Can i ask you another question.

I've seen two different ways to apply animation using the Section Plane.

A - create a section plane and flatten the object / group and save that as Scene 01, then create another section plane and drag the object / group and save that as scene 02

B - create and apply two section planes to the object, one top and one low and apply active cuts

Which option is a better option to use / best practice?