After creating custom line font on drawing layout and saving the drawing as PDF shows different line

After i create the new line font style and apply to the line it updates. after saving the drawing the line font just disappears from the line font list. and when i as as PDF it creates a solid line by default. I saw that there are solution regarding the <fontname>.lsl file but i am not able to understand the solution. Can some one help me out of this problem.