I haven't been very active with FS2000 but have a Quest 3 VR. I am stumped as to how to adjust the altitude select on the Longitude. I know it must be simple.  Thanks.

 I use the altitude selector on the autpilot panel, and rotate the selector with a mouse, the selected altitude shows up at the top of the altitude section on the PFD.

With 10K hours in Lears, Citations and other real world business jets, I know about the AP panel. Mouse didn't seem to respond in VR to accomplish what you suggest. Sorry if I didn't specify a VR issue.

Yep, mouse works for me in VR, it rotates the alt selection knob on the autopilot panel.

I will try this again. I tried using the mouse before but something wasn't cooperating. Thanks.

Just to clarify - This pic taken in 2D to get a screen grab, but looks the same in VR to me. If I hover the mouse pointer just to the left of the ALT knob I get the counter-clockwise symbol, to the right I get the clockwise symbol, then use the scroll wheel to change the PFD selected altitude up or down. Clicking on the ALT knob allows you to change the altitude in hundreds or thousands of feet.

https://imgur.com/a/BqE06R6

I'll try that. Thanks.