I have no idea how to call it, but is it possible to have multiple clips playing juxtaposed next to eachother. Like this

X Y

or

A B
C D

or

A A A
X Y Z
X Y Z

Where a letter is course a clip. All displayed on screen at the same time. How can I achieve this?

Thanks!

you could use the crop and scale effect to resize clips next to each other, each on a separate video track with a composite effect between