Can i add existing item in existing Item Template ?
I have normal item which is used in many process like : quotation, purchase order, now i need to add that as variant in item template
so is this possible to add variant manually in template?
No!
You have to create a template and create a variant.
Previously i have only one item, but now i have 3 more variant like that item, so i need create template
so creating new items is not link with previously created quotations and purchase orders etc.,
how to handle it ?
with this option
i think i need set same item code of my new variant item with existing item
is this correct way ?
Yes … !
First, create a demo item and a demo variant, and then try to merge with the variant for testing. 
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Yes its working
Sharing because this helps anyone 
Previously I have
Item : V1 (Created item without parent because
New
Parent Item : P
Variant Item 1 : V1
Variant Item 2 : V2
Variant Item 3 : V3
So, if you want merge Item V1 with new V1, then follow step
Note: I tested with Quotation, Item Price & Purchase Order
Step 1 :
First change Item Code of old variant set to any Code (Ex. : V1old)
Step 2 :
Then Create Parent Item and Variants, one variant must be with Item Code - V1
Step 3 :
Then Go to Old Item then Rename It to V1, But select checkbox Merge with existing and then save it
Click on Yes in below dialog box
Done
Now old normal item is converted into variant of selected item template
Thank You @NCP
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