If you download and install the free version of TBC from the TBC pages for Construction on Trimble.com you will get the Feature Definition Manager installed once you have TBC Installed. You can then use the Feature Definition Manager from your Start Menu - you will find it under Trimble Office in the list of available applications. You can also run it from the Field Data / Construction Data Menu Ribbon. If you import an FXL file into TBC then you will also get the Feature Definition Manager in the TBC Project Explorer which is the latest way to create the Feature Library.
So without purchasing TBC you can actually get this as Free Functions that support the field systems.
Download TBC from this link
Click Here
Hope that this helps - of course I would recommend that you purchase some parts of TBC based on your requirements and I would be happy to discuss those with you - call my cell 720 323 0481 if you want to discuss them.
Alan