Portfolio question

I have 2 portfolio’s which have the same ISIN in it, how can I differ them in the taxonomies? I can do with a percentage but this means I have to update this every time there is a change in 1 of the portfolio’s. Cant I add every portfolio specificly in 1 taxonomy?
Portfolio’s:


Taxonomy:

you can create 2 securities (linked in fact to only one stock / etf / whatever) with 2 different names

Thanks, that works. Tried to do so before but there was a duplicate error when I entered the ISIN so I thought it was not possible, but could now work around this via an empty instrument

Gives me an other question, is it possible to use different dates (like 'Holding period) for the securities so that I can see the Delta% per portfolio stock because the start date is not equal for each portfolio