Hi John,
That is not as easy as it should be from RM at the moment, because we don't yet support waypoint export in Shapefile format. It's on the list for the next release.
You'd need to use another tool (e.g. qGIS), get your waypoints into that and set the required attributes for the IMC by hand. You can import GPX files into qGIS, and that should pick up the name field - which you would then have to move to a VALUE attribute, and add (as a minimum) U_LIMIT, L_LIMIT, MODE and FONT. You would then export your map from RM in Shapefile format and combine these files with your new waypoint file. There are probably easier/better tools than qGIS for this job, perhaps someone else might have some suggestions..
Matt