Multiplexers and demultiplexers are often confused with one another by students first learning about
them. Although they appear similar, they certainly perform different functions. Shown here is a multiplexer
and a demultiplexer, each using a multiple-position switch symbol to indicate the selection functions inside
the respective circuits:

I was referring to your JPG drawing, a HEF4067 needs 4 output and 1 analog input.

Here you have a multiplexer program.
16 inputs and using only 5 controller IO's

Try to understand it and then you can make a demultiplexer yourself.

It can be made shorter when using a shift register but so it's far better to understand how it works.

Good luck