Working with standard databases > Building and modifying a standard database > Assemblies > About item tables
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Changing the calculation methods for assembly items

How takeoff quantities are calculated for assemblies

Changing an existing item table

Setting up a new standard database assembly

About item tables

An item table returns the appropriate item to the assembly based on your input for one or more variables (or formulas) during takeoff.

You can set up an item table with one or two conditions:

One dimensional - sets up an item table with a single input condition. During takeoff, the item table returns an item based on the entry for that variable or formula. Example

Two dimensional - sets up an item table with two input conditions. During takeoff, the item table returns an item based on the entries for those two variables or formulas. Example