Throttle
I managed to assign Power + beta + reverse to one of the TQ6 throttle lever in FS24 as follows:
I don't use VFHub because it doesn't allow me to adjust the sensitivity curves.
In the MSFS settings, I assign the command Throttle 1 (0 to 100%) to the lever that you wish.
Important, you should invert the axis you have assigned to that command.
In the option hardware settings of the TQ6 (inside msfs config) I select the lever I assigned that command to and set the NEUTRAL value to 0.9.
This way, the TQ6 detent becomes the Caravan's IDLE detent, and the TQ6's reverse section is used for BETA and for reverse when I move the lever to its lowest point.
Prop
For the prop lever, I haven't been able to match the detent to correctly simulate feathering, since I haven't found a command similar to the throttle one (0–100%).
Condition lever
I matched the TQ6 detent to low idle:
Assign the Condition lever command to the TQ6 lever you want.
Like with the throttle lever, set the NEUTRAL value to 0.45 for the condition lever.
Flaps
Flaps have 4 positions (up, 10°, 20° and full), so it's not possible to map them with our axes that only have 3. As with the previous axes, there are ways to make three of those positions work, but it wouldn't be realistic, so I prefer to use keyboard assignments.
Emergency power
For this option I haven't yet investigated the command needed to assign it to one of the axes. I don't know if a command for it even exists.
I hope it helps.
Regards