Using Path Specifications to Save Files in Mac OS

In Windows, when I use the “Save As” command, I often use a file specification to indicate the folder. For example, if I want to save a file named truck.doc in a folder called misc on the c drive, I’ll type c:\misc\truck.doc in the filename box in the Save As command.

How can I do a similar thing in Mac OS, that is, specify the path in the filename to save a file in a particular folder?

Thanks for your help with this!