If your existing system has been created using an earlier Visual FoxPro version (e.g. v3.0 to v8.0), then a relatively simple upgrade to the latest version (v9.0) may be appropriate. Once the system has been upgraded, further modifications or additions can be made, if required, knowing that the system is now in the latest version.
For systems programmed using earlier versions of FoxPro - DOS or Windows, more work will be involved. The extent of the work will of course depend on a number of factors, including the way the current system is written, the tools used and your requirements.
If you don't know what version of FoxPro your system is in, don't worry, just contact us and we will be able to help you.