Dovetail inside model ?

[ronydee]

I want to create a dovetail on the  inside wall of the model.  Creating A sketch using a rectangle and then possible using. draft tool to create any angle i want.

How do i select the inside to create the sketch?   Please see pic that shows the outlined rectangle on the inside.

 

[laughingcreek]

like the attached

[ronydee]

@laughingcreek 

Well I guess I need to understand how to manipulate the planes... I'll review again an thank you for showing me !!

The whole idea and i want to create another platform that will have a circuit board mounted, and that will slide into the dovetails.

But I guess I could have the platform with dovetails  that slides over inside rails?  Would that make any more sense?