Easy. To choose part of your list, you can use the Advanced Search under Query to select it. The selection should appear in the right panel. Select this by highlighting all of them. Or, more tediously I think, you can select Entire Database in the left panel and then selectively highlight just those albums you want to export in the right panel. Then Database -> Import and Export -> Export to Plain Text. You can choose to export all or just the selected items (radio buttons in lower right corner of the box). After you click Next you can choose the fields to export and then after Next again, name the file, choose how you want it sorted and some other format choices. That will do it.