So for GIFI code 1740 (1740-001) I can designate a tractor (I am keeping a block of numbers so that I can group like pieces of equipment together). Then for fuel I could use a block of numbers there also (I am tracking each type of fuel and lubricant too) GIFI 9764 (its a farm that I'm piloting) and so on.Then I am tracking each piece of equipment by its own number (001 to 999) - - - this is for fuel, repairs, parts, transport, depreciation and whatever else you want (using those unique numbers).I'm going to toss in my $0.015 worth because although I'm not running a rental business I am tracking equipment costs and use.What I am doing is increasing the granularity of the database by adding -000 as a suffix on every account.