To transfer tickets, log into the account where you initially purchased the tickets. Once logged in click your username in the top right corner and select "My Purchases". You will see a "Transfer" button on the left hand side, or if you are on mobile you will need to open the hamburger menu beside the search bar.
Once you are on the Transfer page, you can search for events or products, and send them all in one transfer. Once you find the event or product you want to transfer, click "Select Ticket Items" and a menu will open where you can select what tickets/products you wish to send.
Once all of your tickets and products are selected simply click the blue "Select Recipient" button, review your transfer items, and click "Send Transfer"