I don't understand what you're trying to achieve, but you might want to take a look to the "pick" condition.
For every object, there is a "Pick with Unique ID" condition, under the system condition, there are additional "Pick", that let you pick an object depending various other condition.
Let know that if there is no condition affecting an object, the action will affect all of its instances.
Beside the "Pick" condition, if you know any condition that affect the specific instance you want to pick, add it to you action and it should do the trick.