What/which and how to use Pinmux file?

When creating a topic the required drop-downs are not clear as to what to pic. However, I have my carrier board with production Nano module. We tried to use a Pinmux file to add or mod the net-names specific to our board. then created the DT files. Opened the DT file with notepad, it does not confirm my changes. No corrected net-name can be find. Back to forum to find help and fund multiple discussion as to which Pinmux file to be used. It is even more confusion added. Is there any clear direction on what to use and how before I give these board to s/w developers?
There seems to be two Pinmux file out there, which is the one for Nono production module?

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