Thank you for posting here in the Community, @misselany.

It's my pleasure to help share information about converting from Sage to QuickBooks.

The QuickBooks Conversion Tool guides you through a short and straightforward conversion of your business data into a new QuickBooks company file. It captures the current state of your business by importing key lists, balances, and transactions from Sage 50 to QuickBooks Desktop. It also creates a log of the conversion process for your records. Therefore, there's no option in the tool to choose specific period to export.

However, if you find any missing transactions, be sure to check the failed transaction log file located at: C:\USERS\YOURUSERNAME\My Documents\Intuit\QuickBooks ConversionTool\.

You may check this article for additional reference: Convert from Sage 50 using QuickBooks Conversion Tool.

Stay in touch if you have any other concerns by adding a comment below, it's our pleasure to help. Wishing you continued success!