Change Default BOM

Hello,

I would like to change default BOM one can add from Table-->Quick Tables-->All Tables --> BOM Description Down.

By default, Column sequence is ITEM NO, PART NUMBER, QTY , DESCRITPION and NOTES. I would like to interchange column no of ITEM NO with QTY.

Could any one suggest where to replace which file so that I can have updated BOM table once I do Table-->Quick Tables-->All Tables --> BOM Description Down?

Regards

Ketan