Just another simple but useful trick is the use of a hidden button on SSMS at the query window.
But Why would we want to split our Query window?
Well there are many uses for that, because it allows you to visualize 2 different parts of your query or stored procedure (specially when its too big).
Just over your mouse in the button (see image) and drag it down.
But what I really use it for is to add an EXEC stored procedure comment instruction at the top of my stored procedure, while I keep making changes to it.