You can create as many user-defined indexes as you want.
Select a word or words that you want to add to a user-defined index.
Choose Insert - Table of Contents and Index - Index Entry.
Click the New User-Defined Index button next to the Index box.
Type a name for the index in the Name box and click OK.
Click Insert to add the selected word(s) to the new index.
Click Close.
Click in the document where you want to insert the index.
Choose Insert - Table of Contents and Index - Table of Contents, Index or Bibliography.
On the Type tab, select the name of the user-defined index that you created in the Type box.
Select any options that you want.
Click OK.
If you want to use a different paragraph style as a table of contents entry, select Additional styles, and then click the Assign styles button next to the box. Click the style in the list, and then click the >> or the << button to define the chapter level for the paragraph style.