Welcome to the Cove.
I'm not sure which of several files in this thread you downloaded, but since they're all fonts it probably doesn't matter. Before you do anything, you have to install the font. These instructions are based on Windows XP; I think it's probably the same in whatever version you're using, though:
- Navigate to C:\Windows\Fonts. If your system drive is something other than C:, change the "C" accordingly.
- Click on "File" at the top of the page, and then "Install New Font..."
- In the dialog box, find the font file. You said you saved it in My Documents, so it would be C:\Documents and Settings\username\My Documents, where username is your Windows user name.
- Click "OK" and the font will be installed. You might need to reboot in order for your programs to be able to "see" the new font.
As far as using some form of toolbar in Excel, I don't think it's possible. Using any symbol font is a bit clumsy. I don't have access to Excel at the moment, but if I recall correctly there is no Insert>>Symbol facility as there is in Word. You might be stuck with using Windows Character Map, which is accessed by: Start>>All Programs>>Accessories>>System Tools>>Character Map. When you open Character Map, look for he GD&T font in the list, and you'll see something like:
From there, it's a rather tedious process of copying and pasting the desired characters into your document. Select the character you want, click "Select" and then "Copy." The character will be copied to the clipboard from whence it may be pasted into the document. Repeat until you've built the feature control frame you want. The attachment shows what a completed feature control frame looks like.
If anyone here knows of a simpler method, by all means chime in.