I have a stand alone lightroom app which I have been using for years. I just bought the Photography CC Suite which includes LR. Do I have to transfer all my catalogs from my previously purchased LR to the CC lightroom?
There is no difference between a CC or Perpetual license catalog. However, if your existing catalogs are from Lr5.x or before than Lr CC / 6 will upgrade a copy of them. The catalog conversion is triggered automatically when you open the latter version of Lr. Basically, Lr seeks out existing catalogs and offers to upgrade the most recently opened one. The others will be upgraded if/when you try to open them.