You will enter expenses in the column based on the tax that you paid. If you are in HST province, mist likely all your expenses were subject to HST - then you will enter it in the HST column.
If you are in GSt province- you will select GSt column, and if you happened to have some receipts that you were not charged HST or GST you will enter it in the column that had no HST
To decide which box to enter your expenses in, you first need to determine whether you're eligible to claim a GST/HST rebate:
If you're claiming employment expenses, you may be able to claim a rebate of the GST, HST, or QST you paid on them.
If you are eligible for a GST/HST rebate, separate your employment expenses into those on which you paid GST, those on which you paid HST, and those on which you did not pay tax (zero-rated or exempt), and enter them into the appropriate box. Whether you paid GST or HST is determined by the province in which you paid those expenses (e.g. the maritime provinces and Ontario have HST, while Alberta has GST).