Solved Is column sub sorting possible in QSortFilterProxyModel?

Can one of the five QSortFilterProxyModel columns be sort and the other columns not sort?

@Pada_
What "five columns"?
In the normal course,QSortFilterProxyModel
can sort by one chosen column, so is that not exactly what you want? 
@JonB said in Is column sub sorting possible in QSortFilterProxyModel?:
QSortFilterProxyModel
The number of columns is five. You are currently using QSortFilterProxyModel. I want to use the last two columns as a normal model that can not be sorted.

@Pada_
Sorry, I still don't really understand what you are asking.
You can only use one column at a time to sort by in aQSortFilterProxyModel
(if you want to sort by multiple columns at a time, please say so).
If you want to disallow sorting by some of the columns, you could subclass to implement that, e.g. overrideQSortFilterProxyModel::sort(int column)
and do nothing for certain values ofcolumn
. 
Just to clarify, do you want:
Number Letter 4 a 2 b 1 c 3 d to be sorted like this (i.e. the second column doesn't change)
Number Letter 1 a 2 b 3 c 4 d Or do you just want people to be unable to sort by Letter and only sort by Number?

The table below (this sort is the same as the second column does not change). How can I do that?