Okay to Sum Numerical Values of Categorical Variables?

Hi. I have questions regarding categorical variables.

  1. Can you create a scaled variable out of several dichotomous variables? For example if I had 4 dichotomous variables, can I sum the numerical values of those variables so that the sum becomes the value of new scaled variable?

  • If the answer to #1 is yes, can the new scaled variable be treated as continuous, so that it can be used for regression analysis?

Thanks in advance.