I've tried finding information about the Cyrix application, but it appears there is nothing available. No website is configured for this software and no other manuals are available through the websites listed on the Google Search. In this case, it appears that Cyrix Inventory and Accounts Controlling is now a discontinued application without any information when and if it will ever come back.
You will have to select other inventory system or access the built-in Help section for the one you're currently using. Look in the installation directory or access it directly through the main menu bar.