Don't make multiple threads on the same subject. Forum posts are slow by nature, so you'll have to be patient for answers. You should watch all of Tshirt's vids on Game Salad Cookbook (youtube) and gshelper.com.
As per to your specific question, this video should help.
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When touch is pressed constrain self position x to mouse position x and self position y to mouse position y, so you can drag it around
then just put the control camera behavior in it.
Sorry but What is an offset?
As per to your specific question, this video should help.