The key to merging is that there should be no overlap in numbering of the entities like nodes, beam plates etc. If there are, then renumbering is required as outlined in the Word document that Shayan posted. Also one needs to manually copy and paste the data from one file to another using the STAAD editor and ensure that the contents are pasted at the appropriate locations. Copy paste using GUI is not recommended to avoid problems that MichaelK517 mentioned in his original post.
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