Wix-data insert function doent work

I’m trying to import data into a collection from an Excel spreadsheet. The collection includes two multi-reference fields which the Velo CSV import function will not handle. So I can import everything except those two fields. It has been suggested that I use the insert function to insert the data from those two fields into the corresponding rows in the collection. Does anyone have a s suggestion for code that would use the CSV file from the Excel spreadsheet as the source for the insert data?

Thanks