Annotation in assembly mode

Hello all, 

I have a single part that has datum A and B, then this parts gets machined in an assembly, and I want to reference this machining operation(in Assembly mode) to A and B (from Part mode). is there a way to do that in creo?

also, can datum planes be sequential from part to assembly? so if I used A and B datum in part, can I used continue with C and D....etc in an assembly? 

thank you all for your help.