Ok.. so when you click on the "disposal"  the second line says sales description.

In this box enter the category that the asset is in... simple as that.

i normally just use 'sales" or "trade-in' there, but easily you could do

Vehicles-Sales

Vehicles-Trade

Equipment-Sales

etc

Then when ready to print>>reports>>Display Reports>>scroll down to >>Asset disposition by Sale Description.

I am assuming that when you set up the Client >>>

Client Information>>>Category>>>you use this to set up your categories (vehicles, f&F, Equipment, Intangibles, etc), and under Groupings on each asset's main screen, you indicate which of the saved categories that asset belongs to.

I use that report on every client that has dispositions to match up 4797s, gain/loss on Disposition, etc

FAM also, in reports, has the "personal property by year of acquisition" report which i use foe my personal property tax filings. setting us assets defaults to personal property, so you need to "uncheck" that in the first part of the general asset info for buildings, land, intangibles, etc