Hello, thanks for your interest. In each workbook A, B, C, ... are same worksheets, named "Operátori" - this worksheets will be always at position 1. In worksheets at columns D, E, F,... will be list of workers for calendar week. Each column for one calendar week. One workbook is a list of workers from one branch. There are several branches. Every week I have to summarize the list of workers from each branch into one list.