Squarespace website hosting on godaddy with out effecting some pages already uploaded through wordpress.

I have a query. I currently have a WordPress website hosted on GoDaddy with multiple distinct pages. Is it possible to upload my new squarespace website through GoDaddy without causing any disruptions to these pages?

No.

You can't host Squarespace websites on GoDaddy, or anywhere other than on Squarespace.

Can I connect my Squarespace website to go daddy domain and keep other pages that are already made in WordPress? For example, abcd.com needs to be revamped through Squarespace, and abcd.com/xyz should remain as it is.

You won't be able to connect your domain to two separate websites in the way that you have described. You could use a subdomain for one of the websites, or redirect traffic going to abcd.com/xyz to another domain on the other website, but that's not what you are describing.