Setting a start date

Good morning,

Might be a noobie question but I am fairly new to Asta.

I am wondering how to set a line to start on a certain date and not follow the logic.

To put it in context, we can have the gas connection completed after we have removed scaffold but the gas company are booked in for 2 weeks after the scaffold. So the logic on my programme says it will happen right after the scaffold is gone, but I want it to say it is happening 2 weeks after. So when I reschedule it brings it back to after the scaffold.

Is there any way of telling Asta the gas connection is happening on a set date?

Cheers,

James