User can copy Rules (Any type - Event Based, Page Load or Direct Call) and Data Elements from one Web Property to another using the below steps :
1. Select the checkbox for the rule(s)/data(s) element in the UI
2. Click on Actions and then Copy Rules
3. A new pop up will come up which will give you an option to select the Web Property to copy the rule to.
4. Test the copied rule before publishing.
The exact same steps can be used to copy Data Elements.
Please note that we can not copy Configuration or Tools from one Web Property to the other. You would have to manually configure those.
I hope this information helps.