Making simple table (chart)?

Question

I need to make a kind of table (like a grid) as a layer over an image. I will need to do this often, so I am hoping to learn a fast way to do this (I'm new to this work).
Basically I need a rectangle frame, 30cm high, with column lines at 7cm intervals all the way along (for example extending to 140cm wide in total). Rather than draw the lines by hand (I don't even know how to make them properly horizontal or vertical yet) I am hoping there are some tricks as to how to do this fast, and propery measured.
Really appreciate any help!

Answer 1

If You have Illustrator on Your machine it might be easier to create the graphics there and insert them as a Smart Object.
Other than that there are of course options in Photoshop:
One could create a path-rectangle with the Rectangle Tool (U), then hit command-T and enter the correct values (including the measurement units in the W- and H-fields), with the Pen Tool (P) selected command-alt-click the Path (to activate all points), copy and paste, command-T again, enter the correct value in the X-field, then hit command-alt-shift-T a number of times (thus creating additional copies with the last Transformation applied to each one).
Then with the Brush selected hit the Stroke path-button.
Or starting from that path one could create a Solid Color-Layer (white, then set to multiply, thus making it invisible) and add a Stroke-Layer Effect with Position: Center.