Can "send level settings from one input channel to all of the mixes" be copied to another channel?
Yes, it can.
(PM1D V1.6 or later, PM5D) Open the CH COPY screen in the INPUT/OUTPUT VIEW function. Select the "SEND" option from the parameters listed and then execute the copy.
(M7CL, LS9) Open the CH COPY screen in the CH JOB screen. Highlight the "WITH MIX SEND" option and then execute the copy.
(DM/0) In the PREFERENCE 2 screen, highlight AUX or ALL and then copy the channel by using the COPY and PASTE keys on the panel—you may also use USER DEFINED KEYS with those functions assigned.