Axis one — who
A department is a cost centre wearing a friendlier name.
It is deliberately one flexible concept rather than several rigid ones, because organisations mean different things by it: a team, a branch, a division, a site, a programme, a funded project. Whatever you mean, it is the thing you will eventually want a total by — and it is carried on sixteen different record types so that total is available everywhere rather than in one module.
Users A person belongs to a department, which is how activity and cost attach to a team by default.
Employees The HR record's department, separate from the user's, because an employee may not have a login.
Asset custodians The department a custodian is attached to, so custody rolls up to a team.
Assets The department currently responsible for an asset — where it sits on the balance sheet of accountability.
Asset movements Both ends: the department it left and the department it reached. A transfer between teams is two facts, not one.
Pooled asset balances A quantity held by a department rather than by an individual — the shared projector, the site compactor.
Pooled asset movements From-department and to-department on every quantity that moves, for the same reason as individual movements.
Procurement RFQs Which department is sourcing, so spend under negotiation is attributable before it becomes an order.
Purchase orders The committed spend, coded to the team that committed it. This is the one finance asks for first.
Budgets A budget belongs to a department, which is what makes budget-versus-actual a comparison rather than two lists.
Projects The delivering department, so project cost and departmental cost reconcile rather than double-count.
Workflow tasks The team a piece of automated or assigned work belongs to, for load and throughput by department.
Helpdesk tickets Which department owns the ticket — the basis of a queue rather than a single shared inbox.
Ticket categories A default department per category, so routing is a property of the category rather than a decision per ticket.
Departments themselves Name and description, with a default one seeded so nothing is ever unattributed on day one.
Everything above, reportably Headcount by department, spend by department, custody by department, tickets by department — one dimension, many questions.