Position the cursor over a sheet tab at the bottom of the drawing window, and then right-click and choose Insert Sheet.
If you position the cursor on a working sheet tab, the sheet created is a working sheet.
If you position the cursor on a background sheet tab, the sheet created is a background sheet.
Tip:
You can attach a background sheet to any drawing sheet using the Sheet Setup command on the Application menu. Click the Background tab on the Sheet Setup dialog box to find the background sheet settings.