Whenever i perform a JV and i put a customer/supplier name in the Name column, these entries are not reflected in the individual ledgers of the respective customer?

I'll share some information about Journal Vouchers in QuickBooks, How to import estimate in quicbo. 

The transactions you have entered into the Journal Voucher will appear on the customer transaction list based on how you account for them. If these are affecting Accounts Receivable (AR), it'll appear. However, if affecting the bank and income, it'll reflect in the bank register or your income.

If you need detailed reporting for individual customers, you can run a Customer Balance Detail report. From there, filter the report's period and customer's name one at a time. Here's how:

1. Sign in to your QuickBooks Online account.
2. Click on Reports at the left pane.
3. Look or search for Customer Balance Detail, then open the report.
4. Tap on the Customise tab, then filter the dates.
5. Go to the Filter section, then select the customer's name from the Customer drop-down.
6. Tap on the Run report tab to refresh the page.
7. Repeat the same steps for other customers.

Check out this article to help you filter accounts or customers or format the layout of your reports: Customise reports in QuickBooks Online.

Comment below if you have further questions about managing your General Ledger report. I'll be around to help. Take care!