Brackets vs. Commenting-out

I would like to put two sets of geometry lines in my .inp file and be able to select one or the other set, without removing either of them. I realize I can simply comment out the set I do not want to use, but this gets unwieldy when there are a lot of lines.

Question: Is there a way to put some kind of “brackets” around the set of lines that I would like to (maybe temporarily) ignore in my .inp file?

Thanks, Ralph

Dear Ralph,

you could use a #define card and the conditional preprocessors (#if, #else, #endif).
This way if a #define card (with the specified name) is enabled the #if section will be active, if not, then the #else part.