Configure and manage approvals for problems and automate approval actions through trigger-based and problem workflows. You can create multiple approvals as well as allow users to choose a sequential or parallel approval process from the Advanced Portal Settings.
SDAdmins or technicians with the Modify Approval/Delete Approval role can configure approval and approval levels from the problem details page.
To add a new approval,

You can also configure the approval from problem workflows.
To do that,
Go to Setup > Automation > Workflows > Problems
In workflow, you can choose Approval under Action Nodes.

In the Add Approval form that opens up,
You can automate approvals for problems so that when a problem is raised, the approval will be in place.
Role Required: SDAdmin
To automate approval for problems,
Go to Setup > Automation > Custom Actions > Approvals.

You can configure 3 types of approval trigger settings from Advanced Portal Settings > Problem Management Settings.

Instantly at approval level creation
Trigger approvals automatically once they are added.
Add/send approval notification irrespective of previous approval levels status(Approved/Denied)
Automatically based on previous approval level
Trigger approval emails automatically only if the previous approval levels are approved.
Manually based on previous approval level
Send approval manually only if the previous approval levels are approved, If any one of the previous approval levels is denied, then approval mail send/resend will be restricted.
You can manage approvals from the problem details page. Go to Approvals on the problem details page.
All the configured approvals will be displayed. You can use the respective icons to send email notifications
to the approvers or delete
the approvals from there.
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You can add multiple approval levels and can choose either the sequential or parallel approval process from Advanced Portal Settings.
You can resend approvals until the approval level is completed (Approved/Rejected).
To approve or reject an approval, click Take Action next to the approval and click Approve or Reject.
To delegate your approval,
Click Delegate Approval
next to your approval record.
Select the user to whom you want to delegate and click Delegate.
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After you delegate, your approval status changes to Delegated, and the delegated approver is displayed with a Pending Approval status. This indicates that the selected user can now take action on your behalf.
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You can revoke your delegation by clicking Revoke in the delegated approval record.
After delegation, if original approver acts on the approval before their delegate does, the approval status in the delegated approval record changes to Action Taken by Original Approver and the delegated approver cannot take further actions.
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Technicians can also manage their own approvals from My Pending Approvals
in the header. Technicians can approve, deny, and delegate approvals and revoke delegation, as well as navigate to the respective problem’s details page. Learn more.
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From the email, you can use the problem link to view the details of the problem.
You can also view the task details.

Under Problem Closure Rules, when All Approval levels should be approved is enabled, all approval levels should be approved to close the problem. If any one of the approval levels is denied, then problem closure will be restricted.