In Supporting data > Contract line groups, you can add and maintain contract line groups and group combinations.

A contract line group allows you to group contract lines into categories such as service costs, rent costs, and so on. Whenever you add a contract line to a contract, you can specify which contract group the contract line belongs to.

A group combination is an element to which individual contract line groups can be linked for reporting purposes. When creating a price announcement letter, if you do not want to report on price changes of individual contract lines but on contract line groups or combinations of contract line groups (example; service costs and other costs together), you can instead link the contract lines groups you want to report on to a group combination and then create a price announcement letter for the combination.