Resolved Extend Partition

The partition WinRE contains the OS system for W7. Partition WinRe (G:\) holds a clone of OS W7.
I would like to extend the partition size on both of these, as one is now red barred. My free EaseUS partition manager doesn't seem to be able to do this, and Disk management doesn't seem able either. I presume this is because there are other partitions following on.
Should I reduce the size of (C:\), for instance, hence creating some spare space, by a couple of Gb, and will I then be able to extend WinRE partition.
A step by step solution would be very helpful,
Thanks in advance,
Regards
David D

 

Thank you Arie, I will not interfere with the partitions if it is not required. I had assumed that the occasional updates from MS might fill up the available space, and put my booting at risk,
As always thanks for your help
Regards
David