Hi Mark - if the columns are exactly the same as the other spreadsheet - you should be able to use the Quick Data Load interface to ADD DATA - and the data will be automatically concatenated with the exiting data model.
Please let us know how you do.
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Comparing the data in the same chart object will require a new measure to be calculated if you want a visual comparison - such as Sales 2013 vs. Sales 2014. You can use what is called Set Analysis syntax to create the measure - defined within the chart object itself (using the fx option in the input box for the measure) - or by defining within the Master Items lists.
Hey Mark - in Qlik Sense Desktop this can be done with the load editor or with the quick data load. The latter has the option to 'add' data.
Regardless of which way you use, you want the data from the first load and the new load to be combined into one long table (as if you had manually created 1 big spreadsheet with all the rows from both and 1 set of field headers)
The technical term for doing this in Qlik is called 'Table Concatention' . To achieve a table concatenation you can force it in the load editor by preceding your 2nd LOAD with a 'concatenate' statement. If you don't use the 'concatenate' statement , the tables will auto-concatenate IF every field in both loads has the same field name (case sensitive).
So doing a quick load with 'add' will work IF every field is named the same and you have the same number of fields. If it doesn't work, they you'll have to open the load editor see what is wrong and use field aliases to cause an auto-contanation or force it with the concatenate statement. It will depend on the situation which one to use... either way let us know what happens so we can help.