You can split a service or package posting on the account into separate postings with different amounts and then transfer these part-postings to other accounts.
Highlight the posting in the account and call up the context menu. Use the command Service splitting to enter the amount that you want to split from the total.
i NB: You cannot split a service, if it contains a script or a follow-on service. Likewise, you can not split a package whose component list contains an element with a script or a follow-on service. Splitting such postings would result in faulty revenue distributions.