Need a better way for clients to add already approved vacation to the schedule when first starting to use WFH.

When clients first sign up for and start using WFH, they need to transfer the already approved PTO from their former system to WFH. It can be time consuming to have the employees re-request PTO in WFH for their already approved PTO requests.

Can something be created and added to the system that will allow the client to add the already approved requests to the WFH schedule/system without the need for employees to re-request?