You can transfer multiple items between stores once TSS XP is configured for multi-store functionality.
Reference the multi-store setup guide if this hasn't already been done.
(1) Under the inventory group, click orders and returns, and then click new.
(2) Click on the order type drop down and select 'TRANSFER'.
(3) Click on the destination store drop down, and choose the store you wish to transfer the items to.
(4) Add the items to the transfer order you wish to send to the destination store. TSS with prompt to select which available serial number for items that are forced serialized.
(5) The transfer order can be saved until its complete, once it is posted the items will be removed from the local stores inventory, and added to the remote store.