Hi Cherry,
The code here lets you use the standard File Open/Save dialog:
http://www.mvps.org/access/api/api0001.htm
This gives the Browse for Folder dialog instead:
http://www.mvps.org/access/api/api0002.htm
Then - depending on what sort of files they are - use
DoCmd.TransferText, DoCmd.TransferSpreadsheet or whatever to import
them.
To import directly to an existing table you'll need to ensure that the
structure of the external file matches the structure of the table. If
this is not the case, you'll need to link or import the external file to
a temporary table and then use an append query to move the data into the
"permanent" table while making whatever adjustments are necessary.
This is a fairly vague answer because yours wasn't a very specific
question.