Hi Vijay,
You can extract the sales data into infocube, where you fill 0CALYEAR, 0CALMONTH, or 0CALDAY according to the periodicity you want to load the data into DP (e.g., if you want to load sales data into DP in weekly period, you fill the infocube's 0CALWEEK characteristic according to requested delivery date or commit date).
Then you can use /sapapo/tscube to load the data into DP time series.
BR, Ada