Training Form

Training Form

Hello,
I am trying to address training courses to multiple users.

In Training Form there is a system field, type Lookup, named "owner" that give a single-select choice.
I tried to create a new lookup field with multiple-select choice, and set it as primary, but the training course is still addressed to the owner.

How we can create a single training form and have multiple employee as participants, so we can find this course inside their training tab in profile?

Thank you in advance

Marco