Open the 
No. Series Relationships window.
Specifies the relationships between number series. If you have set up more than one number series code for the same kind of basic information or transactions, you can create relationships between the (related) codes. Then, you can easily use one of the related number series where another related number series is normally used.
The window contains a line for each related number series. You must set up relationships for every number series that you may need to substitute.
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