Excel: Skip spreadsheet columns when importing (refreshing) data

Hi

Let's say I import into Excel a tab-separated file consisting of 10 columns. Excel imports the data into columns A through J.

I can Refresh Data on this spreadsheet at any time, feeding it different 10-column tab-separated files, and the data will be appropriately updated in the spreadsheet.

Now say I insert a new column E into this spreadsheet (with, say, a graph calculated off of columns A-D). It now consists of columns A through K; A-D and F-K have data from the tab-separated file.

How do I Refresh Data on this spreadsheet now? What will happen to that manually entered column E?

Thanks