Hi Vishal,
You can make use of Stock separators (Identified Stocks) to track the goods you receive from your suppliers.
If we take the scenario which you have explained. Create 6 identified stocks which are tagged to 6 of your suppliers. This can be done when you create your istock.
When you receive products from your suppliers use the istock that has been created specific to the relevant supplier. This way you can track which stock has been received from which supplier.
Please note that there is no hard restriction as of now in ByDesign for selection of these istocks. While performing goods receipt the system does not perform an explicit check if the supplier assigned to the istock is infact the sender available in the delivery notification. So you have to be careful not to assign the wrong istock while receiving the goods.
I hope this answers your query.
Regards
Anand