When going through the alignment results, you will find other segments, which have to be joined in source or target language or which have to be deleted, because they have been left out in the translation or because new sentences have been added in the translation. As a result these sentences do not have a counterpart on the source language side at sentence level. If you accidentally joined segments or if you want to split sentences into two or more segments, use the Split button. Just double click at the position in the segment where you want to split it and then click on Split in the corresponding language column.
If the order of segments differs in the two columns, you can change their order by selecting the segment and click on the Move up or Move down buttons.