The combinerawtransaction RPC combines multiple partially signed transactions into one transaction. The combined transaction may be another partially signed transaction or a fully signed transaction.
combinerawtransaction ["hexstring",...]
*bitcoin-cli help 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" (string) 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"]