LaunchForm Mass Issue with JobNum?

I have a button on an BPMform to Launch Mass Issue;

ProcessCaller.LaunchForm(this.oTrans, "IMGO3020");

I’m assuming there is a way to pass a job number to auto-populate the form, as I have another customization that launches Time & Expense Entry with the current employee ID.

string yourEMP = ((Session)oTrans.Session).EmployeeID;
Hashtable YourHashtable = new Hashtable();
LaunchFormOptions lfo = new LaunchFormOptions();
lfo.ValueIn = YourHashtable;
ProcessCaller.LaunchForm(this.oTrans, "UDTimEnt", lfo);

How would someone go about finding out what information is needed in the lfo for a given form?

It does not appear like MassIssue has an LFO Logi built in you would have to customize it.

Okay, thanks Jose, I really appreciate all of your help!