Invert selection

Hi everyone,

I’m cleaning up some older showfiles and ran into a workflow question regarding Subs in Blind

Let’s say I have a Sub (for example Sub 5) that contains both correct channels and a lot of unwanted ones – e.g. channels 601–630, 701, 801, etc.
But in reality, the Sub should only include channels 501 thru 512.

Since Rem Dim doesn’t work in Blind (and not in Spreadsheet view), I was looking for a fast way to isolate the channels I want to keep, and then remove everything else from the Sub without having to manually pick each unwanted channel or build long “thru except” selections.

My current workaround works, but feels a bit clunky:

1. Create a Group X of the channels that should stay in the Sub.

2. In Blind → Sub 5 → Select Active.

3. Minus the Group X.

4. This gives me everything except that Group, so I can delete those channels from the Sub.

This does the job, but I’m wondering:

Is there a cleaner or faster way to invert a selection inside a Sub in Blind?

Or any built-in method to keep only these channels in this Sub?
Maybe some command-line trick I’ve overlooked?

Any advice or tips on a more efficient workflow would be greatly appreciated!

Thanks a lot,
Kris