you can add slide master from insert menu

you can add picture in slide master from insert tab

slide master view help to repeat your objects in all the slides easily

to create slide master click view tab

click on tab of the ribbon

click on the button from tools group

allows you to repeat the format of the text in all the slides

we can create slide master from tab

what does this picture show

in master slide view if you insert a picture to smaller slide ( not the slide master) it will appear in

click on tab

click on