Grouping sales reports into a file

Employer
Elena
Project parameters
Type of cooperationPeriodic employment
SectionTexts and translation
Prepaymentwithout prepayment
Payment methodsBank transfer
Acceptance of requestsfrom Dec 15, 2019 until Dec 30, 2019
Project description
We need a specialist in Excel. It is necessary to group sales reports into a single file once a month. (approximately 30-35 Excel files), within 10 to 30 positions.