Hey! A simple question!

I have two panel data sets, one is quarterly, with 3 variables ID date and value. The date are the end of each quarter.
One is daily, with 3 variables ID date and return. The date is every calendar day.

I would like to merge the two data sets to daily data, that for each ID, there will be a different return every calendar day but same value in each quarter (around 90 observations).

A LOT Thanks!