The phrase "to expand the lineup" means to increase the variety or number of items or options available in a particular product, event, or group. Full definition
RAM is constantly expanding its lineup of rugged trucks to offer consumers a truly customized truck for their needs. (lakekeoweechryslerdodge.com)
The brand is now expanding its lineup in country and launching more and more new smartphones in Indian market. (killerfeatures.com)
If the company chooses to expand the lineup in this way, though, it'll remain to be seen if it also adopts the company's new Infinity displays. (androidheadlines.com)