Antonijo has a great answer - there are many ways to do this depending on what data you want to export. If you are switching to one of the low cost direct replacement programs for RMS like Retail Management Hero (or even Cloud Retailer), then your data will transfer with the switch. If you have decided to start from scratch with a new POS system, then generally some of the basic inventory, supplier, and customer information may transfer to the new system.
Like Antonijo said, you will likely want the help of an Microsoft Dynamics RMS partner in your locale. If you do not have a Microsoft Dynamics RMS Partner, and are in the US or Canada, RITE's tech support team can be reached at 1-888-267-RITE (7483). If you have questions about the low cost "no need to start from scratch" replacement POS programs for Microsoft Dynamics RMS, please call me at 208-994-9404 or email kevina@rite.us