If you want to separate your costs and expenditure into Projects, you can do. You can also rename Projects to something more appropriate - perhaps "Departments" Go to Settings -> Project Options and enable projects. Once you have enabled the ‘Projects’ facility a new tab will appear between the Reports and Help tab. The tab will be labelled ‘PROJECTS’ unless you have chosen to rename it. If you select this tab, you will now have the option to create a new project. And for each sale and purchase you'd be able to assign them to a specific project.