Running Multiple Iterations Simultaneously in Load Runner

Hello all,

I am trying to run a scenario in which my first iteration logs into a site, and saves the session's cookies to global varaibles.  Then all subsequent iterations skip the login process, add the cookies, and jump immediately in to making REST calls with  web_custom_request and web_url.  This is all working as planned.

I would like to have multiple iterations going at once, and I'm not seeing a way to do that.  For instance, after the first iteration (the login), I would like for 2-n iterations of the script to run at the same time.  Within the Pacing settings, I am only seeing that the next iteration starts after the prevoius one finishes.  I would like to start iteration 3 ~5 seconds after iteration 2 begins.

Is this even possible?  Or would I need to make multiple scripts and save the cookies to a file and read them, something like that?