Definition of a series name attribute for a dynamic line chart

Hi everyone, I have created an app based on an Excel spreadsheet and now I want to create a dynamic line chart that accesses this data. In the Domain Model an entity has been created automatically with the columns of my table. Because a dynamic chart needs a series entity in the settings in the "Dynamic series" tab, I want to define this entity in the Domain Model in the first instance. To create this additional series entity and to connect it to the entity of the table is no problem. But how can I tell the "Series name attribute" in my "series entity" to take the related data from my table? Attached is a section of my table to better illustrate the issue. Thanks for your help!  
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