I am gonna break down and offer up a nice fresh fish, but with no pole. https://proconnect.intuit.com/community/help-articles/help/entering-a-bulk-sale-of-assets-in-lacerte...

I will add one more "trick" If you have a group of assets that all need a sale date e.g. 5/31/2019 use Ctrl C to copy that data > Use Ctrl and the ꜜ (down arrow) to get to that field in the next bit of data > Use Ctrl + V to  paste the date there > Repeat > Rinse. This can be used to tie all those bulk assets together. 

Key is tie them all to one asset that has all the sales information.