I hate how Google does that. We should be able to add as many places as we want. I would like to have one for school, work, my house and whatever else.
Here are some alternatives though...
Maybe say the name of your work place. Google might recognize it.
One that's less obvious is to create a contact for that place. Let's say the name of your work place is Bob. Go in your contacts and create a Bob contact with the address of your work place. When you tell Google to give you directions to Bob. It will actually be giving you directions to your work.
I legit thought of this just now so thank you for pushing my mind to think outside of the box cause I've been wanting to do something like this for the longest and it just hit me. Lol.