Scaling objects in place ony in z direction

Hello,

my file contains many rectengular solids (closed polysurfaces) and I want to scale them.
How can I scale them all at one in the Z direction only and make the solids stay where they are?

thanks for any advice

I think you need to use the Scale1D command.

Or you can use the Boxedit by changing the pivot to the minimum Z

yeahh, box edit rocks!

Thank you very much.