How is a contact is created for already existing company customer via webstore. I tried writing the same company name. but it created another company record and then a contact of that company, Now I have duplicates. I tried adding address with other name, but that also didn't work. I am not aware if multiple contact can be created via webstore.

where are you trying this? are you trying to create additional contacts from the register page? As far as I know, you might need to create your own customization if you want to manage add/edit/remove contacts from a company.

Okay, so that means, multiple contacts are created using UI only if no customization is there.

Yeah, you can create them from the ERP side but not from the web store (by default).

Thanks , can you also guide me in this, How would I know which contact of company created a particular sales order.

I am not completely sure, there is an option on the setup website to share or not the cart among the contacts, I do not know if that help to identify the contact, you can take a look at the source code and try to find any useful filter, it there is no way to identify the contact natively, probably you will need to set the contact id on the sales order through a customization.

I don't think we do or ever would allow users to automatically add themselves to a particular parent customer/company record. That seems like a bit of a security risk

Thanks for you help guys, Here is what I have got, The email assigned on the Sales Order is of the contact who placed the order. and in the relationship tab that contact is attached as role order creator.