How do I increase the partition size on the mac side

JohnS8

Bit poster
Hi guys,

I have a MacBook Air running parallels. I currently have 40 odd GB spare on the Windows side and nothing spare on the Mac side.
Is there any way I can increase the Mac side by taking say 20GB from the Windows side. When I go into disk utility it is all greyed out.
Any help would be much appreciated :)

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John
 
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