Hello philatelyny -
If you refer to already active listings, that is correct, the Bulk Revise tool for Active Listings has options for altering prices, but does not have an option to change the listing style.
However, if you refer to your Saved Listings the Advanced Edit option on the Saved Listings page does have the option to change your Sale Type in bulk. You can make a similar change to listings on the Closed Listing page for relists by using the Bulk Relist option and noting the change by selecting the Edit Items button after you have selected your items and clicked on Bulk Relist.
- Craig