Barcode pictures
To create barcode images within the currently displayed table simply select the table cell or cells containing the barcode data and run the PBarcode macro from the list of macros in the Macro dialog.
The barcode picture will be pasted into the cell on the right. Note that the picture will not be visible while in datasheet view; the word Picture will be displayed instead.
It would probably be more usual to create an entire column of barcodes in a datasheet, rather than just one. Select an entire column by pushing the column title button at the top of the column, and then run the macro to generate the barcode pictures.
The barcode pictures may be displayed in a form or report by inserting a bound control onto the form, with its control source specified as the table column containing the barcode pictures.
More:
Font-based barcodes