Commercial Fixed Wing
Air Traffic Control Fully Certified
ATC Issue All Types
General None Reported / Taken
Procedure
I was in the area getting currency time on position. Within the entire 2 hours in which I was there; I worked at 5 different positions. I was moved around numerous times to accommodate training. At the time of the incident; I had been working the R-Side and was briefing a trainee/instructor so that I could move to their D-Side. I had earlier opened the eastern portion of the high/ultra high sectors and then moved to split off the ultra highs from the two high sectors. From opening the ultra highs; I was moved back to the high only sector. After briefing the newest trainee/instructor on the two aircraft in the sector; I moved to the D-Side and from there the trainee handed off an aircraft in our airspace at FL360. This aircraft; an air carrier flight; should have been handed off to the ultra high sector; climbing to FL340 and then the ultra high would have climbed the aircraft. I am not sure if I had climbed the aircraft to FL360 or the Controller that I relieved had climbed the aircraft to FL360. Regardless; the aircraft was on our frequency; we had the hand off and the aircraft was at FL360 which is in the ultra high stratum. The ultra high sector did not have any traffic for the aircraft. It does get confusing; especially that time of the morning; opening up the sectors. We go from one sector having both high/ultra highs; total of 4 sectors and then we split to 2 total sectors; split East/West; in which those two sectors each take a high/ultra high. From that split; we go to 3 sectors. It does get confusing and sometimes the splits are done for only reasons of manning positions.
Enroute Controller described an airspace error listing the de-combining of positions after the MID shift; training preparation and frequent position rotations as causal factors.