set_false_path -from {ModA:ModA_inst|reg_src[144..244]} -to {ModB:ModB_inst|*} ?

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Thanks. This version worked:

set_false_path -from CommandRegisters:CommandRegisters_inst|reg_command_bits -to {MetaDataGenerator:MetaDataGenerator_inst|*}

Having extensive programming experience, it is a mystery to me why anyone would come up with something as ugly as TCL. For example, adding in the {} around the 'from' path above should create a list with a single item but that fails. I'm sure this has to do with some string-substitution rule in TCL...

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It does create a list, but {} stops the interpretation of $i into an index, so the call fails ...

Glad to hear you've got things working.

Cheers,

Dave