Set up approval flow for service catalog

Set up approval flow for service catalog

Hello Team,
I failed to find a proper configuration to achieve this business requests

Service Catalog A needs 3 stages of approvals

Stage 1. Line manage approval
Stage 2. Any of following 
 - Mr. A
 - Mrs. B
 - Mr. D
Stage 3. CEO

Could you please help to point out how to achieve this on ME- Servicedesk Plus?

Thanks,
Eric

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