How to Convert a LibreOffice Spreadsheet Into a Database for Mail Merge ... If creating labels, go to File > New > Labels, select the database, table, and fields. At the bottom, select the type of label paper you're printing to (e.g., Avery A4) and other additional label-making preferences, and then click Save. From there, on the Options tab, click Synchronize contents, and then New document to create your label sheet.