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If you use Microsoft Word, you have almost certainly struggled with Word formatting issues, especially using Word documents created by others and edited by many people. If you are struggling for more than a few minutes with formatting, it is usually best just to clear out the old formatting and then properly format the resulting clean document.
Use the Format Eraser (Windows)
- Select the text that you want to return to its default formatting.
- In Word, on the Home tab, in the Font group, click Clear All Formatting.
Use the Format Eraser (Mac)
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Select the text that you want to return to its default formatting.
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In Word, on the Edit menu, click Clear and then select Clear Formatting. 
Copy and Paste Content
When you copy content from a formatted source, such as a webpage or another Word document, you can select options at the time you paste it into your document.
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Click or tap where you want to paste the content.
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Press CTRL + V and then select Paste Options 
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Hover over the buttons for a live review.
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Select the paste option to use.
Shortcuts for Pasting Text
When you copy text from a Word document, webpage, or other app's document and paste it into a Word document, you can choose how the text is formatted. You can keep the original formatting, merge with the destination formatting, or paste just plain text.
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Keep Source Formatting (K) This option retains formatting that was applied to the copied text. Any style definition that is associated with the copied text is copied to the destination document.
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Merge Formatting (M) This option discards most formatting that was applied directly to the copied text, but it retains formatting that is considered emphasis, such as bold and italic, when it is applied to only a portion of the selection. The text takes on the style characteristics of the paragraph where it is pasted. The text also takes on any direct formatting or character style properties of text that immediately precedes the cursor when the text is pasted.
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Picture (U) This option is only available on Microsoft 365 Subscription. Converts text into an image and pastes that. The text can't be changed, but you can treat it like any other picture or image and use effects, borders, or rotation. When selected, choose options from the Picture Format tab.
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Keep Text Only (T) This option discards all formatting and non-text elements such as pictures or tables. The text takes on the style characteristics of the paragraph where it is pasted and takes on any direct formatting or character style properties of text that immediately precedes the cursor when the text is pasted. Graphical elements are discarded, and tables are converted to a series of paragraphs.
Click here for Microsoft Support for Controlling Pasted Format