Taxonomy hierarchy question

Hi,

I have question in Taxonomy hierarchy

Say..I have got different segments as tools,electronics,toys in the Taxonomy hierarchy...

Now My question is ..I have a field called battery.....which can be seen in all the three segments....coz, tools has battery,electronics has battery,toys can have battery...

Client requirement is battery field can be seen in all three segments leaf node..and its the same field in all 3 segments....

eg: AAA batteries should be there in all 3 segments leaf nodes..I say its not possible....any suggestions ?