Making a Macro in Excel

Employer
[no-member:pro]Albina[/no-member:pro]Albina
Project parameters
Type of cooperationOne-time project
SectionOther / Miscellaneous
Prepaymentwithout prepayment
Acceptance of requestsclosed
Project description
There are files in Excel with invoices, the task is to combine 5 files into one and reduce the data in the invoice by a certain percentage.