Hi, thank you for contacting JustAnswer.com. My name is Russell. I will do my best to provide the right answer to your question.
As I understand it, you want instructions on how to configure (or 'program') your Olivetti 7100 register for just-plain-usage, with a X-report or Z-report of totals at the end of the day ?
Is there any problem with this simple a configuration that you can mention? have you tried? and is the register used (and thus possessed of former owners' programming/configuration) ?