1. For the purposes of data reporting and of monitoring under this Regulation and the Activity Level Changes Regulation, the operator shall divide each installation into sub-installations. For this purpose, the installation's inputs, outputs and emissions shall be assigned to one or more sub-installations by establishing, where relevant, a method for quantifying specific fractions of relevant inputs, outputs or emissions to be assigned to individual sub-installations.

2. For attributing the installation's inputs, outputs and emissions to sub-installations, the operator shall carry out the following steps in the descending order:

(a) if any of the products as specified for product benchmarks listed in Annex I are produced in the installation, the operator shall attribute the related inputs, outputs and emissions to the product benchmark sub-installations, as applicable, applying rules set out in Annex VII;

(b) if inputs, outputs and emissions qualifying for heat benchmark or district heating sub-installations are relevant at the installation, and do not qualify for any of the sub-installations referred to in point (a), the operator shall attribute them to heat benchmark sub-installations or to district heating sub-installation, as applicable, applying the rules set out in Annex VII;