DaFlame, yes, in increments of 1000 as offered. If I am at 25,000ft or higher I usually ask for a 10,0000 ft, descent depending on the terrain I am flying into. ATC usually steps you down once or twice anyway. If I am at 25,000 and select a 10,000 ft altitude change I will be asking for 15,000 ft flight level (actually I have my co-pilot handle all ATC comms). Typically but not always ATC will give me FL180 first with 3000 ft later.
Hope that is clear.
Happy Landing.
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