The command rename changes the name of the specified model(s) to new-name and/or changes model ID number to new-id (if a single model is specified and no other model already has new-id) or submodels of new-id (if multiple models are specified or new-id is already “taken”). The new-name should precede the id option if both are given, and if new-name includes spaces, it should be enclosed in quotes.
Model names and/or ID numbers can also be changed in the Model Panel by double-clicking and entering a new value. See also: open, combine, renumber, changechains, name, display hierarchy
rename #1 mutant4
rename #5 id #3
rename #8 "closed conformation" id #5
rename #1-10 id #11
The last example would give models #11.1, #11.2, ... #11.10, effectively grouping them as #11.