I need help I'm new

Hello, I made a sketch then made it a solid object. I am recreating a spray paint cap and at the top of the cap it indents. Now that I have a solid object, is there any way to add the indent or to have to go back my sketch phase and work it from there?

*I might do it like this ’


Make a sketch with lid and indent shape. Revolve the lid. Extrude the indent shape. Subtract it from the lid. Shell the lid.