Product tax codes can be set globally for a Walmart category or individually for each product.In the case of global settings, you can go to  Walmart > Configuration >  Walmart Configuration > Walmart Product Global Settings. and select Global Product Tax Code Category and set Global Product Tax Code Value. (You can search and select tax code via select tax code button ). After Selecting the Tax Code, Save the configuration. In the case of product wise tax codes settings, go to product edit form and under the Walmart tab, update the value inWalmart Product Tax Code field (You can search and select tax code via select tax code button ). You can also view all Walmart tax codes from Walmart > Support > Walmart Tax Codes grid.