How to Merge ADF Table Column Header in ADF Table ?

Hi All,
We need to have ADF Table Column header to be "Merged",
e.g :
There are two columns Header : | Qty (Case) | Qty (Pack) |,
can we customize it to display like this :
| ----- Qty -------|
| Case | Pack |
where there are two rows in column header, the first one is "Merged".
How can we do that ?
Thank you very much,
xtanto

Hi Kelly,
Thank you for your reply,
Using Column Faced, Header I can format the header of one column Only.
My requirement is to Merge header of two colums :
| ----- Qty -------|
| Case | Pack |
'Case' &'Pack' is two different column, so I need to add one row on the header of the two colums, then 'merge' them, and add the word '----Qty----'.
Is it possible ?
Thank you,
xtanto

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