St.form that covers SOME (not all) inputs in sidebar + main window?

I cant seem to be able to do this. Can some one please show me an example of a single form/form_submit block that cover some inputs from the side bar and some inputs from the main window (excluding some inputs from both). Is this possible? or do I have to use 2 seperate form blocks?
If yes, pls show a short example. Thanks

A form is a container element. The container has to be somewhere (either the body or the sidebar, not both) then things get put into it.

You can have two separate forms, one on the sidebar and one in the body, but I don’t think it is possible to have a single form that groups some items from the sidebar with some items from the body.