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The subdivision modifier apply button is grayed out, therefore I am unable to apply. Below is the screenshot for clarification.

enter image description here

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    $\begingroup$ Most likely this donut is linked duplicate (alt+D) of another one. So that they share the same geometry and you can't modify this geometry applying the modifier. Use "object/relations/make single user/object and data" so that it is no more linked. $\endgroup$
    – lemon
    Dec 19 '20 at 10:58
  • $\begingroup$ Why is that. Does Blender does not support modifier on linked object? $\endgroup$
    – Haziq
    Dec 19 '20 at 11:11
  • $\begingroup$ It supports modifiers on linked objects, but applying them will modify the geometry and as this geometry is shared by other objects, this is not allowed. $\endgroup$
    – lemon
    Dec 19 '20 at 11:33
  • $\begingroup$ But if you link the modifier it is ok. Select both objects (the one with the modifier as active) then ctrl+L and "modifiers". Now you can apply on all objects. $\endgroup$
    – lemon
    Dec 19 '20 at 11:35
  • $\begingroup$ From what I understand. We can indeed apply modifier on the link object, but it is not good practice. It is better to apply the modifiers then make the linked duplicate copy. But not before. $\endgroup$
    – Haziq
    Dec 19 '20 at 11:48
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I managed to solve the issue by selecting the object on which I have to apply sub div modifier, then I "make the single user object and data".

enter image description here

The problem was that I had created a Duplicated Linked object Alt + D instead of a Duplicate Object Shift + D.

For those who does not know the difference between Duplicated Linked Object Alt + D and Duplicate Object Shift D below is the explanation:

  1. The duplicate linked Alt +D works as an instance. Meaning it creates the instance copy of the original model, and if I make changes on one model it will affect both.

  2. The duplicate object Shift + D makes a complete separate copy of the object. Meaning that any changes to it will not affect the original model, as it is a completely as separate object.

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