I primarily fly the CJ4. If you are saying you want to input waypoint altitudes that are not part of the pre-set SIDS/STARs, then I haven’t seen that ability in the FMS. I wonder if you can build a flight plan in the world map with waypoints with custom altitudes, but it’s not something I’ve personally tried. Typically pilots just want to ascend, cruise, descend to land. Having custom altitudes along a route (aside from a SID or STAR) would be pretty unusual and wouldn’t surprise me if not possible.
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