Replied 3 August 2017, 2:34 pm EST
Apologies for replying so late. Do you want Spread to parse the extra sheet added by your user OR do you want Spread to ignore the extra sheet?
If it is former then unfortunately there is no way Spread can parse the file until and unless the extra sheet has been added in the Schema.
If it is latter then yes there is a way. While creating Schema, in the SpreadSheet Schema Wizard, we need to select the Data Range and then Spread will only parse the data in this range and will ignore the remaining part. For e.g. if Excel file has 3 worksheets and I want to parse only first 2 sheets then I will select only these 2 sheets in the "Data Range" while creating Schema. Remaining all sheets (even though created by users) will be completely ignored by Spread.
Let me know if you have further questions regarding the same.