It's how they pick their schedules. Very seniority based. It'd be tough to explain as every area does it a little differently. You may refer to "this is my bid" and mean a couple different things in context. Some areas have more than one location to work - I may be trained at pirates and jungle and mansion, but might hate the jungle so I bid 1 pirates 2 mansion 3 jungle. I may hate working mornings so I bid closing. My bid may be weekends off.
Essentially it means the semi regular schedule that a ft and pt cm may be assigned to. I'm greatly oversimplifying but that's the gist.
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