Here are some ways to combine multiple Excel files into one:

1. **Manually copy-pasting worksheets** from each file to the master workbook by using the ‘Move or Copy’ option.
2. **Write a VBA code** to merge the files.
3. Use the **‘Get & Transform’ tool** to merge multiple excel files easily.
4. Use **Ablebits Data tab > Merge group** and select Copy Sheets > Selected Sheets to one Workbook while the master workbook is active.

Here is a step-by-step tutorial for the first method:

1. Open all the Excel files you want to merge.
2. Right-click on any worksheet tab and select **Move or Copy**.
3. In the Move or Copy dialog box, select the workbook where you want to move or copy the selected worksheets.
4. Select **Create a copy** if you want to create a copy of the worksheet in the destination workbook.
5. Select **Create a copy** if you want to create a copy of the worksheet in the destination workbook.
6. Click **OK**.

You can repeat these steps for each worksheet you want to move or copy.