Let end user decide size of table

Is there any way I can let my application users add rows in my application and automatically create attributes withing the cells created? This instead of me as an administrator have to add rows manually in Mendix. I would like to do this as this creates freedom for the end user how large the table should be in which they want to give input. Another question related to this. I want to let the user put in about 40 integer values in a table. Do I have to create attributes for all these values or is there a more easy way I can combine them within one attribute? I do prefer this option with putting the data in a table instead of using file uploading. Thanks
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