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increase field limit on multi line layout

hi,
I am a newbie so forgive if you find my question silly.
i need to write a code to increase the multi line layout field limit from 20 to 30.
i am planning to call VF page.
I am not getting clear idea on how to proceed with the implementation.
I thought of creating a table which will have opportunity line items fields.
The problem is recordvarlist is not supported for oppurtunityline items and if i try to access oppurutnity line items from oppurtunity,the VF page is not visible to select in button and links in oppurtunity product.
Can anyone please help me how i can proceed or any other idea??Any help is appreciated.
thank you so  much in advance.