Extending sheet metal

Hiya,

For some reason I as struggling with something which looks like it should be dead simple... hopefully someone can help. I am pretty compenent with Solidworks, but pretty new to sheet metal.

How do I add to a sheet metal part, and not end up adding a second body?

I can't add a tab, since the edge to extend has a bend in it. And I can't just adjust the original sheet metal part, since it's the result of a mirror and I don't want to change the seed body. Hopefully the attached screengrab will show what I mean.

I think I'm just being a dumbass, but its driving me nuts. Surely I don't have to add a second body and then combine?

Thanks in advance,

Tom

SolidworksSheet Metal