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Hi, Input file has 3 Headers (3 Rows). How can they be merged as 1. Sample file attached
Merged cells, as in the first two rows in your sample screenshot on the left, are a bit problematic, when you intend to manipulate the data. Depending on the amount and exact structure of your data, you could consider to import your file wihtout the two rows that have merged cells. You can than rename the attributes with the rename attributes operator and give them the desired name.
Please note that RapidMiner cannot handle two Attributes (i.e. columns) with the same name or role.
This needs to be handled upfront.