This is a question that will be different for every organization due to size of the company, industry, hazards present, etc. There are no requirements on the format of managing the documentation. You can keep you documents and records in electronic or hard-copy format as you see fit, or any other format that works for you. Many companies have documents and records that are in a word processor format, stored electronically, and when created, updated or changed they follow rules that meet the requirements of ISO 45001:2018 Clause 7.5.
2. How many Files or folder I need to create or make for documentation?
This, again, depends on the company. You need to define for your company, and the processes you use, what procedures you will need for your OHSMS. This will then determine what records you need to keep for each OH&S process. As for folder structure, this is up to you and is not defined in the standard. It is common to create a folder structure that matches the process es you have, but how this is done is up to you.
3. Files record must be according to clauses or according to documents given in series?
There is no requirement to use the clauses of the ISO 45001 standard to identify your documents, records or folder structure. It is best to create a folder structure that matches your documentation structure so that you can store documents and records in an order that makes it easy for you as an organization o find them.
4: How many box files do I required for documentation?
If you are storing hard copy files, the number of boxes you require will depend greatly on the number of procedures and records your processes require you to keep. Remember, there is not a requirement to have a different storage method for the ISO 45001 documents and records, so if you already have another management system in place (such as ISO 9001) you can use the same documentation process. You may also have many OH&S records in place to meet legal requirements, and this can help you to understand the space needed for records as they will become part of this storage.