Perhaps this will help, I was in help and found:
Give specific users access to protected ranges
You must have Windows 2000 to give specific users access to ranges.
On the Tools menu, point to Protection, and then click Allow Users to Edit
Ranges. (This command is available only when the worksheet is not protected.)
Click New.
In the Title box, type a title for the range you're granting access to.
In the Refers to cells box, type an equal sign (=), and then type a
reference or select the range.
In the Range password box, type a password to access the range.
The password is optional; if you don't supply a password, any user will be
able to edit the cells.
Click Permissions, and then click Add.
Locate and select the users to whom you want to grant access. If you want to
select multiple users, hold down CTRL while you click the names.
Click OK twice, and if prompted retype the password.
Repeat the previous steps for each range for which you're granting access.
To retain a separate record of the ranges and users, select the Paste
permissions information into a new workbook check box in the Allow Users to
Edit Ranges dialog box.
Protect the worksheet: Click Protect Sheet in the Allow Users to Edit Ranges
dialog box.
In the Protect Sheet dialog box, make sure the Protect worksheet and
contents of locked cells check box is selected, type a password for the
worksheet, click OK, and retype the password to confirm.
Note A sheet password is required to prevent other users from being able
to edit your designated ranges. Make sure you choose a password you can
remember, because if you lose the password, you cannot gain access to the
protected elements on the worksheet.
