Merge command: [stratt-boxsubtitleh3 ]
Merge variable/item: strAttBoxSubTitleH3

Comments:
This wraps [stratt-boxsubtitle ] in an h3. If [stratt-boxsubtitle ] is empty no h3 is generated !

Formula:
@If(@Trim(strAttBoxSubTitle)="";"";"< h3 >"+strAttBoxSubTitle+"< /h3 >");