Simply copy the eq2ui_inventory_bank.xml file to your ...\Sony\EverQuest II\UI\MyUI folder.

If this is your first attempt at installing a new UI component, then open windows 
explorer and navigate to your Everquest II UI folder this is usually located here 
C:\Program Files\Sony\EverQuest II\UI but may vary depending on how you have setup 
your PC.  select the folder called Default and copy it (right click select copy)
then paste into the same folder, and rename it to MyUI. Your UI folder should now
have the following files and folders:

C:\Program Files\Sony\EverQuest II\UI
				Default
				EQ2MAP
				fonts
				MyUI