Give us the bigger picture: why?
You can only export one batch at a time from the JE screen, that is the way the beast works.
You have a number of options, depending on your programming skills:
1. Write a VBA macro to export a range of GL batches, you still export one batch at a time, but you can run it from a starting batch to an ending batch.
2. Write VBA to export transactions from either GLPOST or the batch tables.
3. Use something else (like Access) to query the tables and export.
4. Write a macro to consolidate GL's across companies.
5. Buy GL Consolidations, that's why it is there.
I am assuming your desire to export multiple batches relates to an equal desire to import them somewhere else, like in another GL. You see, I am still working on my mind reading skills here, so I may be wrong.