When you paste between two word 2010 documents that have different style definitions, the user can select one of the four ways to preserve source format, use target style, merge format, and preserve text only to resolve conflicts that occur in different style definitions, as described in the following ways:
Step 1th, open the Word 2010 document window, and click the file → options button, as shown in Figure 2012010709.
Figure 2012010709 Click the Options button
Step 2nd, open the Word Options dialog box and switch to the Advanced tab. In the cut, copy, and paste area click Cross-document pasting, resolution of the style definition when it conflicts the Drop-down triangle button, select the Keep source formatting, use target style, merge format, or keep Text Only option as needed, and click OK. As shown in Figure 2012010710.
Figure 2012010710 Click the Resolve when the style definition conflicts when you paste across documents drop-down triangle button