Hi @Oktawian,
Welcome to the Microsoft Q&A forum.
I would like to provide you with the following information:
As you described, you only want to copy columns D, E, and H instead of copying all columns.
Please follow these steps:
Step 1: Click on one of the three columns you want to copy.
Step 2: Hold down the Ctrl key and click on the other two columns one by one.
Step 3: Then press Ctrl + C.
Excel will copy only the columns that you selected.

I hope this information is helpful. Please follow these steps and let me know if it works for you. If not, we can work together to resolve this.
Thank you for your patience and your understanding. If you have any questions or need further assistance, please feel free to share them in the comments on this post so I can continue to support you.
I look forward to continuing the conversation.
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