Leave Approvals are configured per team - a Team is defined as a group of people with the same approval flow.
Go to Organisation > Teams and create a new team or select one from the list. For more information on how to set up and configure teams, take a look at the following article: Setting Up & Editing Teams.
Go to the Leave Options & Approvals tab.
You can set up different approval flows for Leave, Sickness & TOIL/Comp Time. Sickness and TOIL can be switched off per team too, if it's not something you'd like to track.
Click on Leave Requests.
From here, you can add people to the Approval flow for Leave Requests. You can add multiple employees to the approval flow either in the top level, or add up to 3 levels of approver.
Approvers can be Primary or Alternate. Primary Approvers will receive email notifications when the request is submitted, whereas alternate approvers will only see these requests in their dash once logged in.
When you add employees to the approver list, ensure you click the 'Add' button on the right hand side, otherwise it won't save.
If you have more than one approver at one level, you can choose how many are required.
Once you're happy with the configuration, click Save Changes.
You can then repeat the process on the Sickness Reports & TOIL Allowance Claims tabs.
Approval flows can be different for each type, or you can use the 'Copy from' Feature - this will ensure the approval flow is the exact same.