You won't be able to create customers passwords manually for security reasons, but you can make the process a bit easier by sending customers account activation emails. This is how the process would look like:
1. Create Customer Accounts in Shopify:
Log in to the Shopify Admin.
Navigate to the "Customers" section.
Click on "Add customer" to manually add a new customer. Enter the customer's details, including their email address.
Or use the "Import" option in the Customers section to bulk import customer details using a CSV file. Ensure the CSV file has all the necessary details, including email addresses.
2. Send Account Activation Emails:
Once you've added the customers, they won't have passwords set up yet. Instead of setting passwords for them (which isn't secure), you can:
In the Customers section, select the customers you've just added.
From the "Bulk actions" dropdown, choose "Send account invite". This action will send an email to the selected customers with a link to activate their account.
Customers will receive an email with an activation link. By clicking on this link, they'll be directed to a page where they can set their password and activate their account.