Explanation of "other placeholders"

[nfotx]

In the Data Form, beside the contacts tab, is "other placeholders." Can someone direct me to instructions for using other placeholders?



I need to know how to use the other placeholders when data is not available for each header value.

For example, some companies I know the district sales manager's name, but on other companies, I don't. How do I create a smooth-looking mail merge without knowing all the names?