I have the bellow tables in my dataverse $,$ model driven app solution.

SMART Audit Customers, SMART Audit Customer Equipment, Assets entity view V$3($mserp$),$ Customers V$3($mserp$).$ Last two are virtual tables.

In SMART Audit Customers, I have arb$\_$Customer lookup column, whose related table is Customers V$3($mserp$).$ In SMART Audit Customers table it shows $2$ 'Customer' name relationship $-$ first is arb$\_$SMARTAuditCustomers$\_$Customer$\_$mserp$\_$cu $($related table Customers V$3($mserp$)$ with many to one$),$ second is arb$\_$smartauditcustequipments$\_$Customer$\_$arb$\_$sma $($related table SMART Audit Customer Equipments with one to many relationship$).$

When we click on new record in mda, SMART Audit Customer form opens up and shows Customer column under Finance and operations which relates to Customers V$3($mserp$)$ table.

We will choose the from the Customer dropdown and click on New SMART Audit Customer Equipment button, which will open the new form of SMART Audit Customer Equipment, this table has arb$\_$Customer $($Lookup column that is looking to Smart Audit Customers table$),$arb$\_$SerialNo $($Lookup column that is looking to the Assets entity view V$3$table$).$

So it means Smart Audit Customer Equipment has a relationship with Smart Audit Customers & Assets entity view V$3,$but there is no relation between Assets entity view V$3$& Smart Audit Customers.

We want to filter this arb$\_$SerialNo dropdown which shows the 'Existing Assests' view from Assets entity view V$3($mserp$)$ table.

We want to filter this dropdown so that it shows record related to only that Customer that we selected in SMART Audit Customer form under Finance & operations.

Please give the JS code for this and also let me know where and which function to pass as event handler in the form.