Create virtual users with different logins

Hello there

Usecase:

I created a SoapUI project, which is testing several steps against our webservice-interface.

The steps are alike the following:

1. 1) Start session (Login)
2. 2) Do actions (using sessiontoken)
3. 3) Stop session (logout)

That works as far. Now I am able to create a LoadUI Tests out of this - works perfect.

Problem:

I should use "different" login accounts for the "Start session part"...

So finally my question:

Is it possible (at all) in LoadUI to use different logins for each virtual user?

Thanx in advance

Roman