This article describes how to go from a standard table...
...to a table where columns with a sample size under a specified threshold (e.g. 50) are made blank:
1. Select your table.
2. In the toolbar go to Automate > Browse Online Library > Modify Cell Content > Blank Cells with Small Sample Sizes.
3. Select the appropriate threshold under Minimum Column n.
4. By default, Also set values of first table statistic to NaN is ticked to set blank cells to NaN.
5. Press OK.
Note, this rule uses the Column Sample Size for blanking the cells. A footer note is also added which specifies this condition.