Hello,
The positionning is not always OK, but you can try with hidden line:
@startuml
SourceTable1 -right-> TargetTable1
-right-> Table3
Table4 -right-> Table2
BCRS -right-> AccountName
-right-> AccountNumber
Branch-right->AccountName
SourceTable1 -down[hidden]-> Table4
Table4 -down[hidden]-> BCRS
BCRS -down[hidden]-> Branch
@enduml