Selecting the Cutting tool in photoshop, you will drag the cursor on the image you are using and click the lines you desire to cut in it. The lines will appear in a blue colour and you can move separately them with Move Tool.
Unloack the image, select the layer, use the tool for cutting such as Pen tool, polygon lesso tool. Trace around the area you want to cut and then clear
I got of photo of four people and I need to put in another photograph which should look real. I think I can use magnetic lasso tool but I need better than this to get a realistic view. How it can be done in Photoshop. Any help is appreciated to solve my problem