Hello,
First, please try to copy a column including tabs in vertical selection mode. To do this easily, first make sure the Ruler is visible by selecting “View > Ruler” on the menu. Double-clicking on the Ruler above the column you want to copy — to select the specified column. Press CTRL + C to copy that column to the Clipboard, move the cursor to the beginning of the column where you want to paste the Clipboard, and then CTRL + V to insert the column.
If you want to copy data from a different file, please make sure to select as a vertical selection (pressing the ALT key while selecting, or press CTRL + SHIFT + F8 to start selecttion). This way, when you press CTRL + C to copy, the Clipboard contents are in the vertical selection mode.
I hope this helps. Thank you!