Can i use this to combinate more files?

Yes. In Adobe Acrobat Pro it is very easy. there are a couple of ways to do it. You can open one pdf, and select "Organize Pages". From that screen you can drag and drop the pdf file you want to add to the document. From that "Organize Pages" screen, you can rotate, move pages to other orders, and even delete whole pages. Simply save the document as a new file name and your'e all set to share it.

Yes. How to combine and merge files into one PDF: Within Acrobat, click on the Tools menu and select Combine Files. Click Combine Files, and then click Add Files to select the files you want to include in your PDF. Click, drag, and drop to reorder the files and pages. Double-click on a file to expand and rearrange individual pages. Press the Delete key to remove unwanted content. When finished arranging files, click Combine Files. Click the Save button.