The assistant manager was a position below that of the manager.
The novel Hotel Royale ended with foreign investors buying the hotel and leaving the assistant manager in charge. Upon hearing this, William T. Riker proposed that the stranded USS Enterprise-D away team fulfill the novel's plot by buying the hotel themselves. (TNG: "The Royale")
According to early TNG Season 1 concept art devised by Mike Okuda the tattoos used for Ferengi ranks were designated terms in accordance to their purported "mercantile preoccupation", the Ferengi symbol with three chevrons (which was ultimately unused in the series) indicated a "salesman, first class", which was comparable to an "assistant manager". (Star Trek: The Next Generation - The Continuing Mission, p. 62))