Adding hidden values to a text and having them add up in a total box

Hi Guys, I'm a newby to advanced excel. I am doing rostering and I want to assign shifts to my employees but I don't want the hours visible. So they will be assigned as below. 

I would like the shift codes to have an underlying value and add up to the amount of daily hours in the total box, then I want the hours to be carried over to another sheet with the weeks hours.

Does this make sense?

Can someone help me please?

https://1drv.ms/x/s!AiwNo2pggGBtpUaotYU3tEDZsS6s?e=5xVCwZ

Shell7