can original civil plaint be modified at appeal at high cour

No plainth can't be amended at time of appeal.

Is there any other way out as the civil suit was regarding a benami transaction under fiduciary capacity and reason or motive of the transaction was written in plaint as " due to unavaiodable circumstances" but actual reason was that real owner purchaser was in joint faimily and to avoid complications of brothers claimimg partition in the property he purchased in the name of his brother in law(sala).He was not aware that he can purchase in name of wife or due to fear of brothers.There was no question of black money or tax evasion as he being a small businessman.Will the hon. HC consider this fact while deciding the appeal.pls help