Use this dialog box to add source drawings to your current drawing set.
Select the file names of drawings to attach. Click Add. You can change the drive or folder and continue to add files to the Selected Drawings list. When you finish, click OK.
- Look In
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Select a drive alias from the list. AutoCAD Map 3D toolset creates a drive alias for drive C. You must create drive aliases for all other drives that you use.
If the drive or folder you want is not listed, click Create/Edit Aliases to display the Drive Alias Administration dialog box where you define a new drive alias. 
To open a preview window that displays a preview of the selected drawing, click Preview. In some instances, such as if a drawing is locked, the Preview window is blank. - File List
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View all drawings in the current directory.
- Filter
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Use wild-card characters to filter the display of file names. For example, enter t* to view only file names starting with the letter t.
- Add
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Add the selected drawing names to the Selected Drawings list.
- Remove
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Remove the selected drawing names from the Selected Drawings list.
- Selected Drawings
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To use these drawings, click OK.
You must have Alter Drawing Set privileges to attach and detach drawings.