Assuming that the PK is auto incremented, you just access its property:
Using job As New PRJTJobsBO
With job
.NewRow()
.job_Customer = "jeff"
.job_Name = "Jeff's Job"
If .Save = MicroFour.StrataFrame.Data.SaveUndoResult.Success Then
Return .job_ID '-- if job_ID is the BO property that contains the ID
End If
End With
End Using