Why? My Designs will save your time on building sites by allowing them to reuse saved elements or groups of elements.
You can now save the elements to the Add Panel that you wish to reuse in the same site or between sites.
Select an element or a group of elements
Right-click on it - 'Save to My Designs'
Go to the site/page you want to paste a saved design to
Open the Add Panel section My Designs and paste the saved element. You can keep the element style from the origin site or paste it to match the target site theme