Combinerawtransaction

combinerawtransaction ["hexstring",...]

Combine multiple partially signed transactions into one transaction.
The combined transaction may be another partially signed transaction or a 
fully signed transaction.
Arguments:
1. txs                 (json array, required) A json array of hex strings of partially signed transactions
     [
       "hexstring",    (string) A transaction hash
       ...
     ]

Result:
"hex"            (string) The hex-encoded raw transaction with signature(s)

Examples:
> bitcoin-cli combinerawtransaction ["myhex1", "myhex2", "myhex3"]