There are two methods that you can use to set column to merged column. $tableprop.mergeColumns(int number)When you put the statement in to a column, it will be set as merged column in a specified number. For example: Template Code: | Project | $tableprop.mergeColumns($Package.size())Packages |
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| #forcol($p in $Package)$p.name#endcol |
Output:  Image Modified
$tableprop.mergeColumns(String stringNumber)When you put the statement in to a column, it will be set as merged column in a specified string of number. For example: Template Code: | Project | $tableprop.mergeColumns(“3”)Packages |
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| #forcol($p in $Package)$p.name#endcol |
Output:  Image Modified
See Creating Merged Column Horizontally for DOCX. | Note |
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| The number of cells will be increased by the value in mergeColumns. For example: Template code #1: | $tableprop.mergeColumns("5")Package |
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| | #forcol($p in $Package)$p.name#endcol |
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In case there are three packages, the output will be: 
Template code #2: | $tableprop.mergeColumns("5")Package |
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Output: 
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