How can i covert polyline to one line

Hi

I am new in solidworks software . can you please help me on below problem?

Please not to below picture :

I want create some hole with eqaul distance on all side of the this part but by curve driven pattern it only select one edge and in the complex part it is so hard to select

all edge to craete these hole pattern on it so i need to covert all edge to one (like an spline).

Please help me to know how can i covert and jion all line to one line , like an spline ?

Thank you

Merry Christmas