Even easier if you have 3D polylines. If you open the Attribute Table and then the Field Calculator enter this line item. Then do as Dave showed and pick your new field.
z( start_point( $geometry ))
Dave & Michael,
I really appreciate your help. If there is any way that I can return the favour please let me know.
This is the first time that I have participated in an open Forum and I must say that I am impressed with the comradery.
Wish you guys the best and I hope you don’t mind if I ask more questions in the future.
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I am just glad that I could assist. There is a great group of experienced guys and gals on here and I definitely have learned allot from them as well. @Dave can be a little hard-nosed (and I as well) 
, but that is where the best innovation comes from. Have a great week!
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