We don't normally make changes for "option" changes, i.e. shirt sizes and such, however, that is a future enhancement to be able to let TDs make those modifications to orders. However, refunds and division changes can be made if necessary.
I personally create a google sheet, or excel document that I point to the export link (BETA) using a formula called ImportHTML (in google sheets).
For instance in Google Sheets Cell A1 of your document should read. (Be sure to change [PID] to your unique tournament PID.
Using Excel you can create a Data Link "From Web" and insert the URL from above and then select the table to import.
Once that formula has been entered the table will populate automatically from our site.
Because this data will update automatically from 4DG every time you load the page I then create a second tab with a series of formulas in it to allow me to modify the input.
So on the second tab (I call the first tab 'Import' and the second tab 'data') I create a formula in cell A1 that simply copies data from A1 in the Import tab.
I then copy that formula right and down to get all the data from the Import tab. So cell A2 will say
=Import!A2 and B3 will say
=Import!B3 if copied correctly.
This gives you all the data you need...but if you need to make a change to a specific cell then you can just delete the formula with the Import formula and type in what the data should be, i.e. Large instead of Medium, MA2 instead of MA3 etc.