Merge command: [stratt-boxsubtitleh1 ]
Merge variable/item: strAttBoxSubTitleH1

Comments:
This wraps [stratt-boxsubtitle ] in an h1. If [stratt-boxsubtitle ] is empty no h1 is generated !

Formula:
@If(@Trim(strAttBoxSubTitle)="";"";"< h1 >"+strAttBoxSubTitle+"< /h1 >");