You can copy the security roles and approval routings of an existing Spend or Journal Approver to another user. This will eliminate the need for hundreds or even thousands of manual entries when new approvers are added.
You will need to know the MyID of the employee you are cloning the security roles from, as well as the MyID of the employee, you are assigning the roles and routings.
Tutorial Resources
Quick Start to Financials Approval Pools