copying data from subform to master form

[stevie1969]

I have a form which contains a subform. I want to be able to select a record on the subform and click a button to copy that record's data into the main form.

At the moment the main form has the current record showing company, date and payment. The subform shows in datasheet view all the previous payments from which company for the current client. To save typing the same amount each month I would like to be able to click a previous payment and the current record is populated with company and payment and I can add the date

thanks