Note: This article discusses how to move curve points in GB version 1-3. GarageBand '08 has addressed this issue with effect automation and locking of automation points
One of the biggest deficiencies with GarageBand's implementation of Volume and Pan Curve points (We'll refer to them collectively as simply "Curve Points") is that they belong to a Track, not a Region. What this means is that if you Move or try to Copy and Paste a region or part of a region, the Curve Points do not travel with it, it remains wherever it was assigned in a track. This means that should you have to move something after creating a set of Points, you have to move the points by hand.
Unfortunately you also can't copy Curve Points, so there is no way to duplicate a Curve, or move them between tracks, however you can at least move multiple Points at the same time, thus keeping your finely tuned curve intact.
Take a situation like this:
Quite a scary collection of Curve Points. Now suppose I need to move this region so that it started at bar 61 instead of 60?
Ack! No joy in having to recreate that mess, or even move the points one by one! However if you hold down the Shift key and click on each point you can select as many of them as you wish:
Better yet you can Drag-Select by clicking within the Curve area and selecting the entire group of points with a single drag. Simply start by clicking above or below the actual curve line and dragging:
All the points you drag across are selected. Now you can click on any one of them and drag the group:
And there you go, an easier way to move curve points