Hi Ernesto,
Greetings from Syncfusion.
Query#:- It is possible to sort a column using another as
a reference? For example, "sort TaskName by StartDate desc".
From your shared details, we suspect that you need to
perform MultiSorting for the TreeGrid columns. In order to perform multiple
Sorting, (sort two or more columns), hold the
CTRL key and click the column header. Please refer below demo and documentation.
https://ej2.syncfusion.com/vue/demos/#/material3/tree-grid/sorting.html
https://ej2.syncfusion.com/vue/documentation/treegrid/sorting
Screenshot:-

If your requirement is different from above, share detailed
Explanation, Screenshot or Video demo to proceed further.
Regards,
Farveen sulthana T