Devices or units? This page is about units, the vehicles and assets on the map. To move the tracking hardware on its own, see Allocate a device to another account. For the difference, see Devices and units.
Allocate a unit when a vehicle moves to a customer, a depot or a sub-account, or when another operator takes it over. The account you choose then sees the unit, its trips and its reports.
In the side menu, select Units > List View.
On the unit's row, select Allocation.
The Unit Allocation dialog opens with the current account and operator.

In Unit Reallocate To, choose the account.
To reach an account below another one, select the plus sign next to the parent account.

Optional: in Unit Operator, choose the operator.
If the unit is in use by another account, a question names both accounts. Select Yes to end the current allocation and start yours, or No to keep it.
You can also start from the map. On the unit's row in the unit list, select More, then Allocate. The More button on the unit card opens the same menu. The menu has no Allocate for an archived unit, or when your account has restricted sub-accounts. See Unit list and Unit card on the map.
To move many units to the same account, select them in the units list, then select Allocation in the bar above the list. The dialog asks for the account, the dates and the transfer options once, and a confirmation states how many units move. It has no Unit Operator. See Act on many units at once and Unit Allocation dialog.