possible to add "trim first minute" to chain?

Yes, but you need to add a plug-in.
Try the “Current Version” from: https://forum.audacityteam.org/t/trimtrack-plug-in/14323/1
To trim 1 minute, adjust the start time by -60 seconds (minus sixty)

Instructions for installing: http://wiki.audacityteam.org/wiki/Download_Nyquist_Plug-ins#Installing_Plug-ins