Require approval before something is released

Open Settings, then the Approvals tab (behind the toggle 4 more) in the section Bookkeeping. Only the firm owner and admins can change it.
There is one card for each topic: Incoming invoices, VAT return and Month-end close. A policy (the rule who must approve) only applies once you tick Require approval on its card.
Set From amount so that small amounts pass without approval; if you leave it empty, every amount needs approval. Set the Currency: an amount in another currency always needs approval.
Build the Approval chain with Add step. For each step choose Who approves: Role, Person or Outside person. An outside person, such as the parent company, approves through a personal link that expires, so enter their Name, Email address and Language.
Use Add in parallel to let several people approve in the same step. Tick Approve steps in order (the next only after the previous) if each step must wait for the one before.
Set Reminder after days and Link valid (days), then choose Save. A policy that is switched on needs at least one step.