Any quick method from Closed Auction to Store Auction and vice versa?

1) What is the easiest and quickest way to transfer a “closed” 7-day auction over to a “store” listing?

Use the Import Listings button on the closed listings page to save the listing to the Imported Listings folder in Saved Listings, i.e. that's what that button specifically does for "Closed" listings. You can then revise the listing and Save/Schedule like any other saved listing.

2) What is the easiest and quickest way to transfer a “store” auction over to a 7 day auction?

Ditto to solution on item 1. However, that solution is limited to "Closed" listings. There isn't a current method (as far as I know) to import active listings.

A relist from Closed might have some limited capabilities to edit, but I think that's more than these two problems can handle (or I'd feel safe attempting).

Danno