"to be of assistance" is a somewhat formal expression that means "to help". You can say, "I am glad that I was able to help at the party". Or you can say, more formally, "I am glad that I was able to be of assistance at the party".
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Is [the] word "being" in this sentence [used to] make the word "assistance"... [ a ] noun / verbal noun [?]No. The word "being" is used because it is the gerund form of "to be". A gerund form must follow the expression "look forward to".
I am glad that I was able to be of assistance at the party". - can we write this sentence in "being" form
Looking forward to being of assistance should you need further help.