Custom Function Help

Basically what I am try to do is update the price list automatically. On invoice creation I want it to look to the custom field and if its value is one then set the price list to {1}

I have a custom field in contacts Label: Price Band, Value: 0 - 6

but the bit im struggling with is I can't find the correct command to get the price list map in the invoice

its not listed here https://www.zoho.com/invoice/help/settings/automation/custom-functions.html

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