This is a general question and not related to specified URL. I have some websites that contains many categories. Now i want to split some categories.
For example: I have "office table and chair" category with unique URL and this page ranked with some keyword about "office chair" and "office table".
Now i want split this category in two categories.One for "office table" and one for "office chair".
And question is:
How can i say to google that old category changed to this two categories? and how to change URLs in SERP for related ranked keywords?