Do you sell it all at once or do you hold something back?

We all know about the benefits of up-selling to clients but sometimes this is not a good thing to do. If you have a time dated product and you also have products that can be sold throughout the year it is best to hold those back until the time dated product is sold out and then your client does not have the option of having one or the other but you have left the door open to go back later with an item or items that can be used as an added benefit to the client. You have also not depleted their budget all in one session and left an opportunity to go for the 80/20 rule. 80% of your business from 20% of your client base. However, I hasten to add that I am not averse to selling a whole suite of products if I feel the time is right and the client will benefit from more than one product, but more about that and the 80/20 rule in another post.