Newbie question on manipulating list data

Hello,

Given a list, suppose I want to keep all rows that have a non-unique column A value?
For example, given

A1 A2 A3
Toyota blue 4
Toyota red 3
Toyota green 2
Ford blue 3

I want to keep the three rows with "Toyota" in Column A. The opposite effect of the "unique" function, that is.

Thank you in advance.

Data -> Filter -> Autofilter

and then what?

Thanks for the spreadsheet. I still do not know what to do. Is there a macro in that sheet that I should use?

I should add that the sheet Iam looking at has thousands of rows, each keyed by an integer ID in column 1. I need to keep the rows that have an ID in common with at least one other row

If my data looked like

Toyota blue 2
Toyota red 4
Toyota green 4
Ford blue 4
Audi red 2
Audi blue 4

I want this as my result:

Toyota blue 2
Toyota red 4
Toyota green 4
Audi red 2
Audi blue 4

I would select "Toyota" and then "Audi" from the drop down? And then what? Combine the results(3 rows and then 2 rows) into a new sheet? This isn't possible with the data I am looking at, where there are hundreds of distinct IDs that are used by more then one row