When making a drawing of a part, many people would like to place a balloon on that drawing with the position number from that part in the assembly, where that part is used.
At the moment, the balloon on a drawing of a part will always show number "1".
I understand the difficulty, because the same part can be used in several assemblies, and most likely, it will not have the same number in each assembly.
As a workaround, some people do place an assembly and make all parts invissible, except the needed part. In this case it will get the assembly-position number.
Perhaps, it would be nice, if you are able to place a balloon on a drawing of a single part and have the possibilty to choose an assembly from which the part number will be extracted and link the balloon to that specific assembly.