Hi svl123,
What exactly are you trying to achieve?
You can burst the channels at the same time. You can also modify the Drive Data in your timing if you want something to have an offset. Is this what you are wondering?
When you are talking about the Minimum required edge separation, this is referring to time required between the "driving" events. In most cases, you would just worry about Drive Data and Drive Return, unless you are using the SBC format. I would refer to the timing help for more information:
Timing