If I purchase a subscription and a report at the same time. Will the report be deducted from the subscription?

No, if a report is purchased at the same time as a subscription (both in the basket together) you will be charged for both the cost of the subscription and the cost of the report. If you wish to use the subscription credit to redeem the report you will need to purchase the subscription first (i.e., remove the report from your basket) and then add the report to your account.