Does any one has solution for the problem while importing data from Excel file into signal builder?

I am using signal builder to provide test cases to my model. I have imported data from xls file into signal builder. Later I need to change 1 or 2 values in xls file. So I have to import it again and while importing, we will choose 'replace existing dataset'. Provided that number of inputs and number of test cases are same. Just my values got changed 1-2 places.

After importing data when I go to the model, All the connected signals from Signal builder to model are disconnected(red dotted unconnected signals) and alignments are also disturbed. This is very disgusting. Every time if there is any change in a value(there is no change in no of inputs), I have to connect again. If number of signals are more than 30, then......!!!