To use mail merge to create a batch of gift certificates or coupons with tracking numbers, you need to set up a data source that contains a column listing the tracking numbers. If you plan to add only the tracking numbers to your publications, create a data source for the tracking numbers. If you also plan to use mail merge to insert additional information into your publications, such as customer names or addresses, you can add the column of tracking numbers to a data source that also lists the name and address data that you want to use.
An alternative to writing the domain of a sequence in the subscript is to indicate the range of values that the index can take by listing its highest and lowest legal values. For example, the notation {\displaystyle (k^{2})_{k=1}^{10}} denotes the ten-term sequence of squares {\displaystyle (1,4,9,...,100)} . The limits {\displaystyle \infty } and {\displaystyle -\infty } are allowed, but they do not represent valid values for the index, only the supremum or infimum of such values, respectively. For example, the sequence {\displaystyle (a_{n})_{n=1}^{\infty }} is the same as the sequence {\displaystyle (a_{n})_{n\in \mathbb {N} }} , and does not contain an additional term "at infinity". The sequence {\displaystyle (a_{n})_{n=-\infty }^{\infty }} is a bi-infinite sequence, and can also be written as {\displaystyle (...,a_{-1},a_{0},a_{1},a_{2},...)} .
Thanks very much for your prompt reply, which reassured me that I was on the right path. From having read various Help topics, I suspected that I'd have to use an Excel data source for the numbers. Fortunately, my knowledge of Excel was good enough to know about the drag and drop facility to create automatic sequential numbering, so the data source creation was easy. In the end, it was the mail merge (no surprises?) which proved a tad tricky, but I got there in the end. I've used MM many times and quite happily in Word documents, but for Publisher label format, it was of course a bit different. The important bit that I had to discover for myself was the significance of, after getting to the Print stage, going into Print options, to Publication & Paper Settings, and selecting Multiple Pages per Sheet (& in my case, also "Single-sided" cos my default of duplex printing had come up). But TA-DA!  All is fine now. Thanks very much again.
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