import from excel to sql server and do merge

hi we have 26 x 3 spreadsheets with about 600 records to 1000 in each we need to import the data to a msql server that has already the correct tables setup with previous data you need to know how to do merge to our current sql server from excel so all imported records will show on top of the table - not last! so merging old data to the new data. records imported have site URL and site name. records current might have a few more fields so u need to make sure import is correct total to 26x3 tables Note: we do not pay for partial work! only 100% u have to finish in 3 days max U have to report daily on progress we release milestone only when 100% was imported and project is done