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How can I stretch the walls without affecting the top lip?

Hi!
I'm very new to OnShape and I'm trying to modify a pre-existing design. I am looking to increase the height of the walls to accommodate 20mm and 15mm holes for a power switch + speaker cut-out.
I've had a look but I'm pretty out of my depth here, have worked out how to create holes though, I just need to make the sides longer.
Here's the link: https://cad.onshape.com/documents/f5c3883c33d51c91aae6fe0e/w/52f2ae4878163030c85ba355/e/d0ad5bea968f9bb4d0cc2455?renderMode=0&uiState=67ebeb214b4132099efb44dd
Thank you so much for any help you can provide! :)
Answers
A move face operation is one way to do this.
https://cad.onshape.com/documents/e089110a399803ad651b219a/w/56177f687938e8532a5549f5/e/bcf3bb8afc234d0ca643bd3b