How to open multiple images so can combine and not just one single image at a time. Help please

There is also the Window > Arrange > Float All in Windows option as well.

Then there is File > Scripts > Load Files Into Stack

@NTC Ann 

Here is one way. In Photoshop:

• Choose File > Open
• Multiple select the images. (Use Shift if they are contiguous or Command if they are non-contiguous)
• Click Open in the dialog

To combine the images into one:

• Go to Window menu > Arrange > Tile (to see all images)
• Select the Move tool and drag an image from one document to another to create a new layer. Repeat.
  Use the Shift key before releasing the mouse to center the image

To composite:

• Select the part you want to see on one layer, then click the Mask button at the bottom of the panel to hide what you don't want to see. Repeat.

You didn't tell us how well you know Photoshop, so these instructions are brief, plus there are other ways. Please post again if you need clarification. 

Jane