Hi,

You can do this by performing the following steps.

1) At the place in the document where you want to insert the left subscript,

press Alt+= (Alt together with =). This opens all the controls of the Word

2007 Equation Editor on the Ribbon.

2) Click the control with e^x (e and a superscripted x) on it.

3) In the pane that opens, click the option with an array of 3 boxes, two of

which are piled up on the left and one is alone on the right. A similar array

of 3 boxes should then appear in the small Equation Editor control near your

cursor.

4) In the Equation Equator control, type a space in the upper left-hand box,

type your subscript in the lower left-hand box, and type the on-line text in

the right-hand box.

5) Press End twice.