[Chimera-users] mmaker - superposing two structures based on a subset of a chain

Dear Chimera Team, I was wondering if it is possible to superpose two structures based on a subset of a chain (a domain for example). I tried the command: mmaker #0:1-100.H #2:1-100.h but Chimera doesn't seem to take into account the residue selection. Superposing according to a subset of a chain is particularly useful when the chain is formed by two or more domains and the domains are connected by a flexible linker (as in the case of antibodies). I can provide more specific examples if needed. Andrea