Sequential Alpha numeric code in batches, with spaces

Apologies if I am asking something that has already been asked. I really did not know where to look.

What I am doing is setting up a product ratecard sheet to run with our CRM system in work.

Each product has 10 quantities, with 10 different prices, but each product must have the same product code running down in column A

I have thousands of products to put in to dont want to manually type each code in.

I am ok with Excel, but I can not program in VBA, so i am looking for a formula to use.

The code is ZTRA-00001, which will stay the same for 10 rows, then there will be a space of 1 row and the next code for the next 10 rows in the column would be ZTRA-00002 etc.

As I say, I could do this by hand, but I am confident there will be an easier way.

please excuse me, but I can not see an attachment

excellent, exactly what I needed. thanks very much for your help guys