ske_creative

Thanks for your help, this works quite well, but unfortunately this cuts out the keyhole and combines everything to a new curve. I mean I can make changes with the curve tool, but it would be nice to have the keyhole on its own layer. 

Hi,
 
I am new to Affinity Photo and Designer and graphic software in general, so I have a very basic question. 
 
How can I use a shape in AP to mask out an area of another shape. For example, I have a big rectangle and I want to design a keyhole into it, so that the area of the keyhole is transparent and I can look through the rectangle onto the background. I tried to achieve this but every time I use a mask on the rectangle I only cut out everything outside the mask, but I want to cut out the mask or shape itself out of the rectangle. 
 
Thanks. 

Hi,
 
I am new to Affinity Photo and Designer and graphic software in general, so I have a very basic question. 
 
How can I use a shape in AP to mask out an area of another shape. For example, I have a big rectangle and I want to design a keyhole into it, so that the area of the keyhole is transparent and I can look through the rectangle onto the background. I tried to achieve this but every time I use a mask on the rectangle I only cut out everything outside the mask, but I want to cut out the mask or shape itself out of the rectangle. 
 
Thanks.