Answer
You need to cut off the inner objects from the outer object, i.e. to make a difference
(Path → Difference) of the outer object and inner objects, then you will fill only what you want.
To reach it:
- Move your outer object to the bottom (Object → Lower to Bottom).
(Because the difference cut off the higher object from the lower one.) - Select it and select one of the 3 inner objects.
- Make a difference of them (Path → Difference, or press Ctrl + -).
- Repeat points 2 and 3 with other 2 inner objects.
Done. Now you may fill it.
Attribution
Source : Link , Question Author : Wolf359 , Answer Author : MarianD