I assume that by "appropriate fields" you mean setting it for a dot leader.



Probably, this is best done modifying or defining a style. Then applying the Style where you want the dot leaders.

I am assuming you are not creating a Table of Contents by hand. If you are, you are really trying to push string. How to create a table of contents in Microsoft Word

"pushing string" – a new idiom on me, but I'll add it to my lexicon next to "herding cats". That bit more succinct than "striking a match on a jelly" <g>