Resetting cost is recommended in the following situations,
The Price for a meter is changed in the middle of a billing cycle but that needs to be reflected from the beginning of a billing cycle
Subscription is added to billing lately in the middle of the billing cycle but usage is already collected from the Usage Source for the subscription
When the cost needs to be calculated for the previous billing cycles during a new installation (applicable for the Usage sources that provide the old data). By default, the cost is calculated starting the current billing cycle.
To reset the cost follow the below steps,
Navigate to Reset Page in the Admin portal which is under Billing -> Monitoring
Choose the month from which the usage cost must be reset
Click the 'Reset' button
Use below SQL command against Billing Database to check the Reset operation. Result Status should 200 for all the operations.
select * from Operations with (nolock) where DeploymentId = (select Top 1 DeploymentId from Deployments with (nolock) order by CreatedOn desc)