User Defined Function in SSIS multiple data flow tasks

hi guys,

I'm new to SSIS and I have a question about using user defined functions in SSIS.

So i have a sql statement that i use to split a row with for example "1,2,3,4" to 4  new records like "1","2","3","4".

Also have a sql statement to check if the date is valid, etc.

Now my question is: how can I use this UDF in SSIS and also is it possible to create this UDF in the control flow so i can use 1 UDF in multiple dataflow tasks ?

Thanks for taking your time to read this, I hope my question is clear.

Kind regards