How can I combine variables?

These variables all refer to use of prescription benzodiazepines:

valium
ativan
benzo_other

The variables are categorical:
- More than once per day
- Once per day
- A few times per wee
- Weekly or less
- Monthly or less
- I haven't taken this

Because sample sizes are so small, I'd like to combine these variables to ONE variable on benzodiazepine use.

Could you please help me with a code or command?

I also have numerical variables I'd like to combine