I tested your suggestion with the two sample documents which I had uploaded here for you, and it worked. However when I implemented it in my actual document 'Part 1', it created a problem so I had to reverse it ctrl-z to move back to how it was before.

Although when I copied the last couple paras of 'Part 1' and made a new document for this forum 'Part 1 end', the Normal style in this newly created 'Part 1 end' was 24 pt Arial it is true, but the full document 'part 1' from which those last couple paras were copied has a Normal style of 11 pt Arial. As I mentioned in a previous post, there are actually three files which I want to combine. The first two I merged together without incident, to create what is now 'Part 1'. But now I have gone back to the original files which got merged to create 'Part 1', and I see that of the two files, file one has a Normal style of 11 pt Arial, and file two has a Normal style of 24 pt Arial. When I merged file two into the end of file 1, the 'Part 1' thus created took on the attributes of file one, i.e. 11 pt Arial. Even though the two files had different Normal styles, but the merger of file two into the end of file one worked perfectly with no disruption of fonts. When I copied the last couple of paras from 'Part 1' to create a new document for this forum 'Part 1 end', this document inherited the Normal style from file two (24 pt Arial) even though the overall 'Part 1' style is 11 pt Arial.

Anyhow the problem I am facing now is that when I open 'Part 1' with its Normal style of 11 pt Arial, and change that to 12 pt Times Sanskrit, it changes the size of all the Hindi words in the document from 11 pt Nirmala to 12 pt Nirmala. Currently all the English words in 'Part 1' are 12 pt Times Sanskrit, and all the Hindi words are 11 pt Nirmala. It has to be kept that way, as Nirmala font is by nature bigger than Times Sanskrit and so to maintain sameness of size between English and Hindi words, the pt differential is critically important.

Given this problem that the Hindi words are getting changed from 11 pt Nirmala to 12 pt Nirmala when I change the Normal style form 11 pt Arial to 12 pt Sanskrit, what would you recommend I do as a solution. If some such simple setting change could make the 3rd file merger into the end of 'Part 1' successful, it would really be great!