how to apply incremental load for multiple tables please give some example

[Vijaydurga]

Table1:
LOAD CUSTID,
DATE,
OFFICE,
SALES
FROM
[C:\Users\Vijay\Desktop\Book2.xls]
(biff, embedded labels, table is Sheet4$);

Table2:
LOAD COUNTRY,
CITY,
OFFICE
FROM
[C:\Users\Vijay\Desktop\Book2.xls]
(biff, embedded labels, table is Sheet5$);

Table3:
LOAD CUSTID,
DOMAIN
FROM
[C:\Users\Vijay\Desktop\Book2.xls]
(biff, embedded labels, table is Sheet6$);

[Or]

https://help.qlik.com/en-US/qlikview/May2021/Subsystems/Client/Content/QV_QlikView/QVD_Incremental.h...

If you have specific questions not covered by the documentation, you're welcome to ask, but in your situation it doesn't look like there's anything unusual, just one date field in one table that you could presumably incremental-reload off of.