Change a Test Rest Request's link to project's request? "Open Request Editor"

As for your second post, I would use a Groovy script and use property expansion for ID_user and ID_number. 

You can get the resource in the RequestFilter.FilterRequest event handler script with 

String therequestUri = new String(context.getProperty("requestUri").toString())

 and sorry, you need to use string manipulation methods to work with the URL and resource. 

See 

https://community.smartbear.com/t5/SoapUI-Pro/Is-there-any-way-to-get-rest-resource-of-a-rest-step-through/m-p/147648#M33627

It might be a matter of just appending the property expansion to the URL/resource.

Then when that is done, use the context.setProperty("requestUri")   for the new path based on the property expansion for the ID_user.

Of course the expansion is done by something similar to

def ID_user = context.expand('${#Project#ID_user}')

and then you can do something like therequestUri + ID_user    and that should append the user ID. But this presumes you define the user at the project level. You might find it better to define the user ID at the test case level #testCase#ID_user.

I know that this answer is not the specific solution but a start on one approach. Maybe other people have alternatives that are easier. Your project properties ID_user and ID_number might be read off of a Excel spreadsheet. I have not done this.