Hi, Gabriela:
You can add the same attribute to your different ID fields as a reference. Add the attribute to one field, then right click the attribute and select "Reference". You can then select another ID node you'd like to have the same attribute on. You could do the same thing for you ID fields, as well, if you wanted, so that they all were named "ID'.
If you look toward the back of your qRules user guide, you'll find an appendix that describes how to do this -- the directions were written for SaveToSharePoint or SaveToDbxl, and the attribute is called qRulesLink or qRulesFilename, but the additional direction and screenshots should help you if you get confused trying this.
I love adding fields as references. That way if I change the data type of one, they all change. If I add an attribute to one, they all get it. But they can each have separate rules, leaving them somewhat independent of each other. Also, it means I never have to have names like "Id1", "Id2", etc.