If you want to merge multiple word documents and keep the original format, you can use the "document splitting and merging" function already included in WPS20 19:
Operating steps:
1) opens one of the Word documents;
2) Click "Featured Application-Split and Merge-Merge";
3) Click Add File to Merge to set the range of pages to merge multiple documents into one document.
(Tip: This function can only be used if members are enabled. )