CD-r that can be added to later?

here is the proper solution

take a new blank cd-r

right click on data you want to add --> send to --> choose cd drive

whenever you open your cd drive it shows that data to be write

in side bar you can choose option to write that data

here you can do this process again infinite times later on that cd

You need CD-RWs, (Compact Disc-Rewritable)

That way, you can add/take off files as you wish.

it is not possible to do that