Hi @ycphs

I have a problem to output a data frame to xlsx with certain styling like grouping several columns based on some conditions.

I think it will be great if openxlsx can have functionality to do grouping & ungrouping columns & rows, while user need to do some manipulation on data frame.

Currently I am doing it in a VBscript, and call it from R, which hard to trace bugs.

Here is the functionality as discussed, under 'Data' tab in excel