How to define a formula in cost accounting SLA

Summary:

How to define the formula to cover the following condition:

Source: Asset Number"(CST,S,S)

We want to derive the COA segment value by using the 'Asset' from work order

However since there're thousands of asset, thus we want to achieve the condition that if the asset number starts with '****', then the corresponding COA segment 'Activity' is '101';

Or if the asset number starts with 'xyz', then the corresponding COA segment 'Activity' is '102

Content (please ensure you mask any confidential information):

According to the doc:

How to write SLA User Defined Formula based on multiple COA segments (Doc ID 2945493.1)