Using Dynamic Blocks and Tables - AutoCAD 2011 and AutoCAD LT 2011: No Experience Required - page 442

6. At the Specify base point: prompt, use the Endpoint osnap, and pick the
endpoint of the gridline where it meets the circle. Enter 1/64 ↵ ( 1/70 ↵ ).
This reduces the circle to its actual plot height.
7. Repeat steps 5 and 6 for the circle on the left side.
8. Start the ATTDEF command by clicking the Define Attributes button
on the Insert tab ➢ Attributes panel. The Attribute Definition dialog
box opens (see Figure 9.3).
In the Attribute area are three text boxes: Tag, Prompt, and Default.
The cursor is flashing in the Tag text box. Think of the letter in the
grid circle. It's a grid letter, which is a tag that provides the visual tex-
tual information.
FiGuRE 9.3 The Attribute Definition dialog box
9. Enter GRID-LETTER . Don't press ↵ .
10. Press the Tab key to move to the Prompt text box. Here you enter a
prompt that will display asking a future user to input text for the tag
when they insert a block containing the attribute.
11. Enter Enter grid letter , again without pressing ↵ . Press Tab to move
to the Default text box.
Here you enter a default or sample value that will be used if the future
user presses ↵ instead of entering a new value. You want it capitalized in
this case, so enter A .
This sets up the attribute so that the user setting up the grid will
be prompted to enter the grid letter and will be given a default of A .
The capital A lets the user know that the letter should be uppercase.