In case you use FAM (fixed asset manager) to import into ProSeries you can go to Asset > Schedule Tools > Dispose Assets to have the program dispose of multiple assets at once and allocate the sales price and costs of sale across all the assets.  A great feature to speed up the process.  You can use the same Schedule Tools to add in one purchase of the 30 assets and have the program then split into 30 separate assets.  Works in both directions.