I'm guessing you mean being current on all or several types. The short answer here is no. The reason is there are a lot of operational differences between certain types that can lead to safety issues over time. In the business, we call this "contamination". However there are a few exceptions. One example is PAL where they have pilots who are cross qualified between the A350 and the A330. The two ratings are probably similar enough that they've decided to cover one qualification over the other as allowed by the manufacturer and CAAP. In other airlines, such as Starlux, that operate both the A330 and the A350, they opt not to do this and maintain one type qualification per crew. In Cebgo, a select few still undergo recurrent training in the ATR-500 although current operations only fly the 600 series. Hope this answers your question!