The indent buttons on the home tab allow you to increase or decrease paragraph indenting in increments of inches.

0.5 inches.
You may also manually set the indentation. In order to do this, click the "Page Layout" tab and enter the desired values in the boxes under "Indent". The indentation of a text is the distance it has from the left margin (when writing from left to right).

Which approach what do you mean

Answeradd existing fields/