Inserting data into table issue/question

I have a table database where i store some userids and productids. Every time i insert i need to add userid in a field, productid in the other field and go insert. Doing this in the table it will create a row/separate rows with the data i insert.
Is it possible to insert multiple productids for the same userids at the same time creating multiple rows in the table for the same userid?
I add userid in the field, then i add productid1;productid2;productid3 in the other field and on the table...

Inserting data into table issue/question

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