In order to define specific SLAs based upon the reporting time of the order, you can add sub SLAs under a main SLA. This is an example of servicing mechanical and electrical assets. This image is an example of an SLA service with subs specifying different service levels for different time slots.

The main SLA is linked to the contract. On adding an order with a linked service the system automatically searches for an available SLA. When the SLA is determined, the system decides how to act. If sub SLAs are available, the sub SLAs are evaluated first for validity on the reporting time of the order. The reporting time is being compared to the validity period of the sub SLA. Only if none of the sub SLAs comply, the main SLA is applied.