Hi @omkarb26011 ,
I have made a test for your reference.
1. Here is my collection(col_email)

2. Add a Button Control and apply the following formula on its OnSelect property as:
Collect(t1,Filter(col_email,"-" in Text(C2)).C2);Collect(t1,Substitute(Filter(col_email,"-" in Text(C2)).C2,"-",""))

3. Add a Button Control Control and apply the following formula on its OnSelect property as:
RemoveIf(col_email,C2 in Trim(t1.C2));

Best Regards,
Charlie Choi