Multiple Profiles on one steam account

[Accurate]

I have a steam account for games I play. When my grandson comes over to visit, I have games for him to play, but would like him to have his own profile (in game user name and achievements). Is this possible and if so, how do I set it up?

[eram]

Try family sharing, you cant make more than 1 profile on a single steam account, its 1 user per account unless you set up family sharing.

Check this out.
http://store.steampowered.com/sharing/