I found a demo for the Webform module which includes 2 forms: application and application evaluation. Once the application form is submitted, the application evaluation is attached at the bottom of the page showing the submitted data for the application form.

I tried to do the same with two webforms I created: PO and PO Approval. I want to attach the PO Approval webform to the submission of the PO webform.

I did the the follow setup(Structure->Block layout).

Then I tested it.

Differently from the demo, the webform was not attached the webform submission page of the other webform.

How do I attach a webform to another webform's submission?