If i am managing 2 interconnected clients , is there a simple way of NOT duplicating the same transaction between the 2 clients ie sale / purchase, loan given/ recievd

You can use the classes or locations feature, Mrmoasif.

This helps you keep track income and expenses into different departments/clients. 

First. you'll have to turn it on. Here's how:

1. Click the Gear icon, then select Account and Settings.
2. Go to the Advanced tab.
3. Click the Pencil icon in the Categories section.
4. Put a check mark in the Track classes or Track locations box. 
5. Under Assign classes, select either One to entire transaction or One to each row in transaction.
6. Click Save, then Done. 

Then, here's how to create a class or location. Here's how:

1. Click the Gear icon, then select All Lists.
2. Select either Classes or Locations.
3. Click New.
4. Fill in the necessary fields.
5. Click Save.

Once you create a transaction, choose the specific class or location so can categorize them properly. 

To know more about this feature, check this reference about setting up and using class and location tracking. 

You can pop a comment below if you have other questions. Have a good day!