When all required elements are configured you can also use vRealize Orchestrator workflow as item in the catalog. To do this you need to have XaaS Architect role.
XaaS architect | Define custom resource types. Create and publish XaaS blueprints. Create and manage resource mappings. Create and publish resource actions. |
In Design tab you have XaaS Blueprint
When you adding the new XaaS you can create a Custom Form
After adding to Service and setting Entitlement you are able to request new XaaS workflow from Catalog.