Highlevel- i suggest two foreach tasks to loop through for each prefix (4Q09, for example), map the path to a variable, and use a data flow to map as you have layed out.
Repeat this process for each filename:
1. Add a string variable to hold your Excel path
2. Add a foreach loop container
3. Open the foreach and set your enumerator to "Foreach File Enumerator"
4. Folder set to: \\MyNetwork\Drive1\Dropbox\Import\Folder1\
5. Files: 4Q09*.xlsx
6. Click "Variable Mappings" to map your excel path to your variable
7. Index wil be 0, then select your variable name
8. Add a data flow and add an Excel source
9. Once your Excel source is in your Connection Manager (usually at the bottom), you will want to set your "Expressions" and set to your variable. @[User::<<variable name>>]
10. Then just add your destination and map your columns
Repeat this process for the other file name type - I would just add a second variable and foreach loop. You could run this simultaneously.