1. Right click in *.sparsebundle file.
2. Open with ‘DiskImageMounter’
3. Open Disk Utility.
4. With Disk Utility resize the partition ‘Copias de Seguridad de Time Machine’ to the desired size, and keep without partition the rest of the Time Capsule.
5. Now you have limited the space to use with Time Machine to the partition you have resized. You can use the rest of the Time Capsule as a file server.