I need to calculate the total amount before submitting the data

Here we are making hotel reservation app in which I need to show the calculation of the value selection.

is it possible to calculate on screen not on columns

Calculations happen in a table and you display the column values using components pointed to those columns. There is no calculations that can occur outside of a table. If you are are trying to do this in a native form, you will need to instead use a custom form.

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