CSV import questions / duplicate records issues

[Susanb]

Hi,

I will have a supplier that is going to do an incremental upload everyday through our ftp using our csv file set up, will this process overwrite products as it should or will it just duplicate what is already on the web site?

I would prefer not to have duplicates for the simple reason I don't have the time to go in an delete them off especially when it is a daily upload and there are quite a few products.. 

Is there something I need to do in the backoffice first to help with this issue? and if so what do I need to do?

Can anyone help? is there a simple answer?

 

Many Thanks 

Susan