@Tim Edwards what should be the metal width for having 240microamps current from point a to point b and also for that do I need to have specific metal width for internal connections when 240microamps is current

This document: https://docs.google.com/spreadsheets/d/1oL6ldkQdLu-4FEQE0lX6BcgbqzYfNnd1XA8vERe0vpE Tab "layer resistances and capacitances" has a table "electromigration rules (estimated)" at the bottom. That tells you how wide any single metal layer needs to be to sustain a given current without violating electromigration rules. We got no such rules from SkyWater so I calculated estimated values using other PDKs and the metal material (Aluminum) and thickness. So for metal1, for example, with 0.65mA/um max, for 240uA current you should be okay with a metal width of 0.37um.

@Tim Edwards thank you for the information