Note: you must be Admin or manager to perform this operation.
Booking Templates allow a much broader control over your costs and shipments, especially if the booking requests are originated by 3rd parties (e.g. Suppliers).
In order to set a specific Booking Template to require the account's managers or admin approval for each booking, go to your Booking Template section of your account, and select Edit on said template.
Scroll down until you'll find the option Approval. Here you can find two options:
Not Required: All bookings will be managed as usual and immediately passed to our partners to organise the effective shipment.
Approval Flow: Each booking request will be set in a pending state until a Manager or Admin approves the request.