Submaster update

Hi All

After looking around for a while, forums, tutorials, manual I cannot achieve doing a simple thing : update a sub as I would like. 

I've a sub with channels 1 thru 5 and parameters. I need to remove Ch 3. Except going to Blind and AT Enter, I cannot use any update performing this. 

I read somewhere that Update Bump was supposed to update only existing channels in the sub, which is not at all what happens to me. Update adds to the content like Record. [Channel list] Record Load does not remove current channels in the sub. [Channel list] Record RemDim Sub # removes Intensity only but not parameters. 

Can someone show me the right way to proceed ?

Thanks in advance. 

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