Mis-matched sequences -- how do I convert sample rates to merge 3 session files into one?

I am attempting to merge three multitrack sections of an interview done at different times, so that I can match audio and edit as one.   I grouped  all tracks in one of the 3 sessions, and attempted to paste that into another -- but received an alert saying "The sample rate of one or more clips does not match the sample rate of the session.  These clips will not be inserted."

I checked, and one is 44100 Hz and the other is 32000 Hz.    I tried converting individual  clips in the Waveform editor -- but after selecting "convert sample type" and choosing 41000, nothing happened.  So I am stuck with three incompatible files.   I COULD finish editing each one separately, mixdown and try converting those in Waveform -- but would prefer to have the separate tracks laid out in one sequence so I can even out speakers, music and effects before mixing down.

Any advice?  

Thanks in advance for any help.  

Rob