Starting page numbering at a selected number

[kafka]

I have a 250 page document containing my travel diaries over the last 30 years. I want to be able to insert header pages which I have printed separately using Excel in between each trip. I printed the 250 page documents before realising that the pages were printed continuously so that in many cases the end of one trip would be on the other side of the beginning of the next trip, stopping me from inserting a header page between them. I considered breaking up the total document into individual files and printing them individually but realised that each new file (or trip) would begin at page 1 rather than carry on from the last trip. Can I insert some sort of page break between trips so that I can insert the page header sheets?