What version(s) of WoW are you using?

Retail

What problem are you experiencing that led to you asking for this feature?

I cannot find a way to split items, like potions, for trading to a friend.

What solution would you like?

A quick toggle button at the top to allow for splitting.

Any alternatives you can think of?

No response

Anything else?

No response

Disable the "Group identical items" option in Layout. This option will be automatically toggled when you open a trade window though so most of the time it isn't necessary to flip it.