If you wish to hide/show sections of your document based on certain conditions then you can surround that text with conditional merge fields (IF, ELSEIF, ELSE)
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The * denotes that we're doing something special while the IF starts the conditional statement
[[*IF
The standard merge fields from your merge field list should be included in braces (otherwise known as "curly brackets")
{FirstName|pt=Client|rn=*}
Any static values should be included in quotes and there should be an operator in front of that static value
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Finally, you will need to include a conditional field stop
[[*ENDIF*]]
You can add any number of ELSEIF options for additional conditions and ELSE section as a catch-all if all prior IF/ELSEIF conditional are false
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Now say I wanted the text 'BETWEEN' to appear before the first Client's name, and the text 'AND' to appear before every other client's name, so that is it generated in my table like:
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