How to cut the image files from memory card instead of copy them?

[hKuenph]

Camera : EOS Rebel T6s

I prefer having the memory card empty so I do not worry about whether there is enough space of the card when I am out shooting in the mountains.  It seems the T6s can only download which is actually copy the image files from the memory card.

How to cut down the image files from the memory card?

Thank you.

Kuenph

[hKuenph]

Thank you.  Yes, I believe it is Canon's goodwill to avoid deleting image by mistake.  

Appreciate.

[hKuenph]

Thank you.  I always carry threee cards in my bag, all 16G cards.  I usually take at least 20~30 various shots for any one subject, just to be sure that I have at least one good image when I get home.  

Appreciate your advice.

[hKuenph]

Thank you.  Image files go to 2 locations when they are downloaded from camera, hard drive D and a portable hard drive. Image are copied from D to C drive when they are edited in C drive.  And the ones edited will go to the portable drive.

Appreciate your good advice.