qlikview load data from multiple excel to a given date

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I want to load excel data from date 20221009 to 20230130.

Dates 20221009 to 20230130 use Sheet1 but from 20230201 use Sheet 2.
Dates 20221009 to 20230130 use Sheet1, but from 20230201 onwards use Sheet 2.

with Sheet 1 still in place.

I use Code