Sstrhsrtj

I would like the Multicolumns in my tables use the formatting from the parent table. The example below illustrates my question perfectly:

newcolumntype{v}[2]{% Vertigo latin for rotate

>{adjustbox{angle=#1,lap=width-(#2)}bgroup}%

l%

<{egroup}%

}

newcommand*rot{multicolumn{1}{v{60}{2em}}}



csvreader[longtable=*{2}{>{bfseries}l}@{hspace{extracolspace}}*{1}{r}@{hspace{extracolspace}}*{1}{r},

    table head=caption{Transformers} \ 

    cmidrule{1-4}

    &       

    & multicolumn{1}{r}{SI{2}{voltampere}}**hspace{extracolspace}multicolextraspacepadding**



    & multicolumn{1}{r}{SI{3}{voltampere}} \ 

    cmidrule(r{extracolspace}){3-3}

    cmidrule(r){4-4}

    Time

    & **bfseries**rot{Ambient}



    & Core



    & Core \

    (SI{}{minute})

    & multicolumn{2}{r}{(SIUnitSymbolCelsius)}**hspace{extracolspace}multicolextraspacepadding**



    & (SIUnitSymbolCelsius)  \

    cmidrule(lr){1-1}

    %        

    cmidrule(lr{extracolspace}){2-3}

    %        

    cmidrule(r){4-4},

    late after last line=\cmidrule{1-4},

    /csv/separator=semicolon]%

    {Results/Test.csv}

    {

        end time = endutime,       

        amb = amb,

        asn core = asncore, 

        mars core = marscore

    }

    {endutime & amb & asncore & marscore}

So this code produces the first two columns in bold font and then an extra gap after a column "subsection". The output is shown below:

The issue is that custom command rot and other multicolumn commands require additional code, highlighted with **, in order to match the longtable column formating. In this case the second column's rotated heading should be bold like the rest of the column without the extra bfseries and the 3rd column heading should not require extra padding to respect the column's extra spacing. Is it possible to have a multicolumn respect the formatting of its parent table?