Let me elaborate because the title is pretty vague. In photoshop, holding shift will allow you to draw a straight line in a single direction, and depending on which angle the canvas is rotated at, you can either have said lines be vertical or horizontal. Knowing how it works, I've been using it heavily for making backgrounds and making sure things are at perfectly straight, as shown here: 
Note: the numbers are the angles I drew the lines at
Now Photoshop has not been kind to me this year, due it crashing more times this year than it has in the previous 3 years I've used it. Thats why I wanted to draw my second chapter, and future chapters going forward in CSP. But, obviously, CSP does not preform the same as Photoshop and holding down shift no longer allows you to draw a straight line given the rotation of the canvas. This, and my general unfamiliarity of the program is why I've decided to stick with photoshop for Chapter 2.....at least assuming it would rain stable enough for me to use proficiently. A recent development has come up that has made that impossible because now photoshop is crashing every day now. And the only way to stop this would be to buy a new graphics card which are not cheap mind you. I don't think I can last 3 to 4 months if its going to be like this, but I dont know how Im going to be drawing backgrounds in CSP so Im pretty much caught between a rock and a hard place.
So to just cut straight to the point...HELP!!!!