Queries :: OR Using Part Of String From Parameter Box

I have a criteria in a parameter query that asks the user to enter a Subsystem number (such as 4596-666-001).
The source data for my database has Systems (e.g, 4596-666) and each system has several Subsystems associated with it (e.g, 4596-666-001, 4596-666-002, etc). The System and Subsystem numbers are stored in the same column of the source data spreadsheet, and hence the same field in my database.

The source data is structured in such a way that Systems and Subsystems have different information. I would like to set up a query that shows the System information as well as the Subsystem information.

For example, if the user enters 4596-666-001 into the parameter dialog box the query returns all the information for 4596-666-001 and 4596-666 (but NOT any other Subsystem).

As a work around I have set up an OR situation where the user first enters the Subsystem number and then another parameter query dialog opens and they enter the System number. This works but is not as nice as simply entering the Subsystem number and having all information returned.

Is there a way to set up my query so the when 4596-666-001 is entered an OR is generated using the first 8 characters of the Subsystem number?