Partial Reload is used whenever you just want to add some new data without reloading all other tables.
Suppose in your Qlikview file you have 10 tables which has millions of records, if you want one new table then you need to add the script, if you give normal reload it will reload all the 10 tables and the new table. Suppose if you don't want to reload the old 10 tables and just want to add new table then Partial Reload would be helpful.
This can done by using the ADD attribute to LOAD statement.
ADD LOAD * INLINE [
Now if you use Partial reload, it just reloads the Table11.